Title of Invention	A METHOD AND APPARATUS FOR ALLOCATING A SPARE AREA ON A RECORDING MEDIUM OF WRITE-ONCE TYPE.
Abstract	A write-once type optical disc and a method and apparatus for allocating a spare area on the write-once type optical disc are provided. The method includes allocating a data area on a recording medium of write-once type, and allocating a user data area and at least one spare area within the data area on the recording medium, the at least one spare area having a variable size, wherein a maximum recording capacity of the at least one spare area on the recording medium is less than a maximum recording capacity of at least one variable spare area on a rewritable type optical disc.

Title of Invention

A METHOD AND APPARATUS FOR ALLOCATING A SPARE AREA ON A RECORDING MEDIUM OF WRITE-ONCE TYPE.

Abstract

A write-once type optical disc and a method and apparatus for allocating a spare area on the write-once type optical disc are provided. The method includes allocating a data area on a recording medium of write-once type, and allocating a user data area and at least one spare area within the data area on the recording medium, the at least one spare area having a variable size, wherein a maximum recording capacity of the at least one spare area on the recording medium is less than a maximum recording capacity of at least one variable spare area on a rewritable type optical disc.

Full Text	A METHOD AND APPARATUS FOR ALLOCATING A SPARE AREA ON A RECORDING MEDIUM OF WRITE- ONCE TYPE Technical Field The present invention relates to a method and apparatus for allocating a spare area on a recording medium of write-once type and, generally relates to a write-once optical disc, and more particularly, to an apparatus and method for allocating a spare area on a write-once optical disc such as a write-once blu-ray disc. Background Art A new type of high-density optical disc such as a Blu-ray Disc Rewritable (BD-RE) is being developed. A benefit of the BD-RE is that it has a rewritable capability where the quality video and audio data can be written, erased and rewritten thereon repeatedly. FIG. 1 is a block diagram of a general optical disc device for writing/reproducing data to/from an optical disc such as a BD-RE. As shown in FIG. 1, the optical disc device includes an optical pickup 11 for recording/reproducing a signal to/from a BD-RE 10, a video disc recorder (VDR) system 12 for processing a signal from the optical pickup 11 as a reproduced signal, or demodulating and processing an external data stream into a writable signal suitable for writing onto the BD-RE 10, and an encoder 13 for encoding an external analog signal and providing the encoded signal to the VDR system 12. FIG. 2 shows a structure of a general BD-RE. Referring to FIG. 2, an LIA (lead-in area), a data area and an LOA (lead-out area) are allocated on the BD-RE. An ISA (inner spare area) and an OSA (outer spare area) are allocated separately to a front and a rear end of the data area. A user data area having an LSN (Logical Sector Number) is allocated between the ISA and the OSA of the data area. Referring to FIGS. 1 and 2, the VDR system 12 writes input data from an external source in a cluster unit corresponding ECC block having a predetermined recording capacity after encoding and converting the input data into a recording signal. The VDR system 12 also detects a defective area within the data area when recording the data. When a defective area is detected, the VDR system 12 performs a replacement writing operation to write the cluster data from the defective area onto the ISA instead. After the data writing is finished, location information of the defective area and management information for reproducing the chaster data written on the spare area (replacement area) are written as a defect list onto the LIA. FIGS. 3A and 3B illustrate a general structure of a BD-RE single layer and a BD-RE dual layer, respectively. As shown, a BD-RE may have a single recording layer (FIG. 3 A) or two recording layers (FIG. 3B). Referring to FIG. 3A, the recording capacity of the inner spare area ISA being allocated to the BD-RE single layer is 2048 clusters, and the recording capacity of the outer spare area OSA is N x 256 (0= maximum of 16384 clusters. The recording capacity of the data area of the BD-RE single layer is 355603 clusters. The recording capacity of the user data area of the BD-RE single layer is determined to be a difference between the recording capacity of the data area and the recording capacity of the spare areas. For example, when the recording capacity of the outer spare area is 16384 clusters (N=64), then the recording capacity of the user data area is 337171 clusters. As a result, the size of the inner and outer spare areas (18432 = 2048 + 16384) corresponds to 5.5% of the size of the user data area of the BD-RE single layer. Referring to FIG. 3B, in the BD-RE dual layer, the recording capacity of the inner spare area (ISAO) of a first layer (Layer 0) is 2048 clusters. The recording capacity of the outer spare area (OSA0) of the first layer is N x 256 clusters (0= hand, the recording capacity of the inner spare area (ISA1) of a second layer (Layer 1) is L x 256 clusters (0= (L=64). The recording capacity of the outer spare area (OSA1) of the second layer is N x 256 clusters (0= As a result, the total recording capacity of the spare areas of the first and second layers is calculated to be 5.1% of the total recording capacity of the user data areas of the first and second layers. A Blu-ray Disc Write-Once (BD-WO) is another type of high density optical disc that is being developed where a high quality of data can be recorded and reproduced to and from the disc. As the name may suggest, data can be written only once on the BD-WO and is not rewritable on the BD-WO. But the BD-WO can be read repeatedly. As a result, the BD-WO is useful where the rewritability of data on a recording medium is not desired. Recently, standardizing the size of the BD-WO is being considered But allocating the spare areas of the BD-WO as in the BD-RE would cause a problem of wasting precious recording space due to the characteristics of the BD-WO. For instance, in the BD-RE the recording capacity of the spare areas should be allocated large enough since the BD-RE re-records data repeatedly and as a result many defective areas can surface. In contrast, BD-WO is able to write once and thus relatively less defective areas may be present Therefore, it is not necessary and is wasteful to allocate the same amount of spare area of the BD-RE onto the BD-WO. Disclosure of Invention Accordingly, the present invention is directed to an apparatus and method for allocating a spare area of a write-once optical disc that substantially obviate one or more problems due to limitations and disadvantages of a related art An object of the present invention is to provide a write-once optical disc and a method and apparatus for optimally allocating the spare area on the write- once optical disc in consideration of the characteristics of the optical disc. Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, a method for allocating a spare area on a recording medium of write-once type according to an aspect of the invention includes allocating a data area on the recording medium; and allocating a user data area and at least one spare area within the data area on the recording medium, the at least one spare area having a variable size, wherein a maximum recording capacity of the at least one spare area on the recording medium is less than a maximum recording capacity of at least one variable spare area on a rewritable type optical disc. In accordance with another aspect of the invention, a method for allocating a spare area on a recording medium of write-once type, the recording medium including at least one recording layer, includes allocating a data area on the at least one recording layer of the recording medium; and allocating a user data area and at least one spare area within the data area on the recording medium, the at least one spare area having at least one replacement area, the at least one replacement area having a variable size and constituting a part of the at least one spare area or the entire at least one spare area, wherein a maximum ratio of a size of the at least one replacement area to a size of the user data area is less than about 5%. In accordance with another aspect of the invention, an apparatus for allocating a spare area on a recording medium of write-once type, includes a combination of elements for allocating a data area on the recording medium and for allocating a user data area and at least one spare area within the data area on the recording medium, the at least one spare area having a variable size, wherein a maximum recording capacity of the at least one spare area on the recording medium is less than a maximum recording capacity of at least one variable spare area on a rewritable type optical disc. In accordance with another aspect of the invention, an apparatus for allocating a spare area on a recording medium of write-once type, the recording medium including at least one recording layer, includes a combination of elements for allocating a data area on the at least one recording layer of the recording medium and for allocating a user data area and at least one spare area within the data area on the recording medium, the at least one spare area having at least one replacement area, the at least one replacement area having a variable size and constituting a part of the at least one spare area or the entire at least one spare area, wherein a maximum ratio of a size of the at least one replacement area to a size of the user data area is less than about 5%. In accordance with an aspect of the invention, a recording medium of write-once type includes a data area allocated on the recording medium, the data area including a user data area and at least one spare area, the at least one spare area having a variable size, wherein a maximum recording capacity of the at least one spare area on the recording medium is less man a maximum recording capacity of at least one variable spare area on a rewritable type optical disc. In accordance with another aspect of the invention, a recording medium of write-once type includes at least one recording layer; and a data area allocated on the at least one recording layer, the data area including a user data area and at least one spare area, the at least one spare area having at least one replacement area, the at least one replacement area having a variable size and constituting a part of the at least one spare area or the entire at least one spare area, wherein a maximum ratio of a size of the at least one replacement area to a size of the user data area is less than about 5%. It is to be understood that both the foregoing general description and the following detailed description of me present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. Brief Description of the Accompanying Drawings The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of mis application, illustrate embodiments of the invention and together with the description serve to explain the principle of the invention. In the drawings: FIG. 1 illustrates a general optical disc device schematically; FIG. 2 illustrates a structure of a general BD-RE; FIGS. 3A and 3B illustrate a structure of a BD-RE single layer and a general BD-RE dual layer, respectively; FIG. 4 illustrates a structure of a BD-WO single layer and a method of allocating a spare area on the BD-WO single layer according to a first preferred embodiment of the present invention; FIG. S illustrates a structure of a BD-WO dual layer and a method of allocating a spare area on the BD-WO dual layer according to the first preferred embodiment of the present invention; FIG. 6 illustrates a structure of a BD-WO single layer and a method of allocating a spare area on the BD-WO single layer according to a second preferred embodiment of the present invention; FIG. 7 illustrates a structure of a BD-WO dual layer and a method of allocating a spare area on the BD-WO dual layer according to the second preferred embodiment of the present invention; and FIG. 8 is a block diagram of an optical disc recording/reproducing device according to an embodiment of me present invention. Best mode for Carrying Out the Invention Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout me drawings to refer to the same or like parts. Hereinafter, the embodiments of the method of allocating a spare area on a write-once type optical disc such as BD-WO are explained in details according to the present invention in reference with drawings. The present method can be applied in the process of manufacturing a write-once BD-WO single layer and a write-once ED-WO dual layer. Considering the characteristics of data recording on the BD-WO, die maximum size of the spare area can be allocated which is smaller man the maximum size of the spare areas allocated to a BD-RE. In the present invention, the recording capacity of the spare area(s)/replacement area(s) of a BD-WO is kept at less than about 5% of the recording capacity of the user data area. In the present application, the recording size of an area (assuming with no defects) means the size of the area. As such, these two terms are interchangeably used herein. As an example only, an embodiment of allocating the recording capacity of the spare area(s) to about 3% of the recording capacity of the user data area on the BD-WO will be now explained as follows. FIG. 4 illustrates a structure of a BD-WO single layer and a method of allocating a spare area thereon according to a first embodiment of the present invention. Referring to FIG. 4, the BD-WO single layer includes a single recording layer allocated with an LIA, a data area and an LOA. The data area includes a user data area having a logical sector number (LSN), and an inner spare area and/or an outer spare area for writing data of defective areas (i.e., as a replacement area). The recording capacity of the inner spare area (ISA) is allocated to be of a predetermined fixed value (e.g., 2048 clusters), and the recording capacity of the outer spare area (OSA) is variable, e.g., N x 256 clusters (0= The recording capacity of the data area of the BD-WO single layer is allocated to have 355603 clusters. The recording capacity of the user data area is obtained by subtracting the recording capacity of the spare areas (ISA and OSA) from the recording capacity of the data area. For example, when the recording capacity of the outer spare area OSA is at the maximum 8192 clusters (N=32), the recording capacity of the user data area is calculated to be 34563 (=355603-(2048+8192)) clusters. As a result, the recording capacity of the inner and outer spare areas (10240 = 2048+8192) of the BD-WO single layer according to this embodiment is about 3% of the recording capacity (size) of the user data area (345 63 clusters) of the BD-WO single layer. Accordingly, when the recording capacity of the inner and outer spare areas allocated to the BD-WO single layer is adjusted to be about 3% of the recording capacity of the user data area by varying the maximum recording capacity of the outer spare area, the spare areas of the BD-WO are prevented from being wasted and are efficiently allocated FIG. 5 illustrates a structure of a BD-WO dual layer and a method of allocating a spare area thereon according to the first embodiment of the present invention. Referring to FIG. 5, the BD-WO dual layer includes a first recording layer (Layer 0) and a second recording layer (Layer 1). The first recording layer (Layer 0) includes a LIA, a data area 32a, and an outer zone area (Outer Zone 0). The data area 32a includes an inner spare area (ISA0), a user data area 33a, and an outer spare area (OSA0). The second recording layer (Layer 1) includes a LOA, a data area 32b, and an outer zone area (Outer Zone 1). The data area 32b of the second layer includes an inner spare area (ISA1), a user data area 33b, and an outer spare area (OSA1). A data writing operation occurs generally in the direction shown with the dotted arrow A. The inner spare area (ISA0) on the first layer has a predermined fixed size, e.g., 2048 clusters. The recording capacity of me outer spare area (OSAO) on 1he first layer is variable and is N x 256 clusters (0= maximum 4096 clusters (N=16). The recording capacity of the inner spare area (ISA1) on the second layer is variable and is L x 256 clusters (0= the maximum 8192 clusters (L-32). The recording capacity of the outer spare area (OSA1) on the second layer is variable and is N x 256 clusters (0=s with the maximum 4096 clusters (N=16). The total recording capacity of the first and second data areas 32a and 32b is 711206 (- 355603 x 2) clusters. The total recording capacity of the user data areas on the first and second layers is calculated by subtracting the total recording capacity of the spare areas from the total recording capacity of the data areas of the first and second layers. For example, if bom recording capacities of the first and second outer areas (OSA0 and OSA1) are at maximum 4096 clusters (N=16) and the recording capacity of the inner spare area (OSA1) of the second layer is at maximum 8192 clusters (L=32), then the total recording capacity of the user data areas of the first and second layers becomes 692774 clusters ( =(355603 x 2)- (2048+4096+4096+8192)). As a result, the total capacity of the spare areas of the first and second layers (2048+4096+4096+8192 clusters) corresponds to about 3% of the total recording capacity of the user data areas cu the first and second layers. Accordingly, the total recording capacity of the first and second inner and outer spare areas allocated to the BD-WO dual layer becomes about 3% of the total recording capacity of the user data areas by adjusting the maximum recording capacity of the first and second outer spare areas (OSA0, OSA1) and the maximum recording capacity of the second inner spare area (ISA1). Therefore, the spare areas are prevented from being wasted and are efficiently allocated in accordance with the data recording characteristics of the BD-WO. In the first embodiment as shown in FIGS. 4 and 5, the entire spare areas (e.g., toner spare areas and outer spare areas) are used as replacement areas for storing data of defective areas according to a linear replacement scheme. For instance, if a cluster area of a user data area is found to be defective, then the data stored in that defective cluster area is also written onto a spare area functioning as a replacement area for the defective cluster area. FIG. 6 shows a structure a BD-WO single layer and a method for assigning a spare area on the BD-WO single layer according to a second embodiment of the present invention. The BD-WO single layer shown in FIG. 6 includes a lead-in area, a data area, and a lead-out area. The data area has a fixed size, e.g., 355603 clusters. The lead-in area includes first and second defect management areas DMA1 and DMA2, and a temporary defect management area TDMA. TDMA is an area to temporarily record and manage defect management information of the BD-WO until the BD-WO is finalized For instance, if during a writing operation of the user data area, if data in a defective cluster area of the user data area is written onto a part (replacement area) of a spare area according to a linear replacement scheme, then information (e.g., location information, size, etc.) of the defective cluster area and the corresponding replacement area within the spare area is temporarily stored in the TDMA as TDMA information. Then if the BD-WO is to be finalized (e.g., upon completion of the data writing onto the user data area), then the TDMA information stored in the TDMA is transferred to one or each of the DMAs allocated on the BD-WO. In this example, the TDMA provided in the lead-in area has a fixed size, for example, 2048 clusters. The data area includes an inner spare area ISA, a user data area 34, and an outer spare area OSA. In this example, the entire inner spare area ISA is used as an area for linear replacement (i.e., as a replacement area). In other words, an area for temporary defect management is not allocated to the inner spare area ISA. Generally, the ISA has a fixed size (e.g., 2048 clusters) and the OSA has a variable size. The outer spare area OSA includes an interim defect management area (IDMA) and a replacement area 40 for linear replacement In one example, the IDMA is allocated adjacent to the replacement area 40. The size of the IDMA is allocated variably depending on the size of the outer spare area OSA. Since the outer spare area OSA has a variable size, the IDMA also has a variable size. Here, the IDMA is distinguished from the TDMA having a fixed size in the lead-in area in that it has a variable size and may differ from the TDMA depending on a usage manner in recorded timing. However, the TDMA and the IDMA can store the same contents despite the difference between the terms. This will be described later. In one example, the IDMA having a variable size is allocated within the outer spare area OSA depending on whether or not the outer spare area OSA is allocated. For instance, if the outer spare area OSA is allocated, then the IDMA is allocated therein as discussed herein. But if the outer spare area OSA is not allocated, then the IDMA may not be allocated and only the TDMA having a fixed size may be allocated as discussed herein, kt another variation, the outer spare area OSA may be allocated without the allocation of the IDMA therein. However, if the outer spare area OSA is allocated, it is preferable to allocate the IDMA therein. The size of the IDMA positioned at the outer track of the disc depends on the variable size of the outer spare area OSA. In one example, the size of the outer spare area OSA is N ' 256 clusters (0 = N = 64). In this case, the size of the IDMA can be P ' 256 clusters, where P is an integer determined to be P = N/4. That is, a method wherein the size of the IDMA is allocated to be a quarter of the size of the outer spare area OSA can be used in determining the size of the IDMA. For example, if N = 64 is used, then the size of the outer spare area OSA is allocated to be 16384 clusters (16384 = 64 x 256) and P = N/4 = 16. As a result, the size of the IDMA according to the present invention is allocated to be 4096 clusters (4096 = 16 x 256). Similarly, the size of the IDMA may be varied depending on the size of the outer spare area OSA considering that when the replacement area for linear replacement is allocated in the OSA, the size of the replacement area, the size of the DMA, and the size of the spare area(s) depend on one another. In contrast, the size of the disk inner track area (especially the size of the TDMA positioned in the lead-in area) has a fixed value. FIG. 7 illustrates a structure of a BD-WO dual layer and a method of allocating a spare area on the BD-WO dual layer according to the second embodiment of the present invention. Referring to FIG. 7, the BD-WO dual layer includes a first layer (Layer 0) and a second layer (Layer 1). The first layer (Layer 0) includes a lead-in area, a data area 35a and an outer zone area Outer Zone 0. The second layer (Layer 1) includes a lead-out area, a data area 35b and an outer zone area Outer Zonel. In each of the lead-in area and lead-out area, a TDMA of the present invention is provided as first and second TDMAs 37a and 37b, and a plurality of DMAs are provided. A plurality of DMAs are also provided in each of the Outer Zones 0 and 1. Each TDMA provided in the lead-in area and the lead- out area has a fixed size, for example, 2048 clusters. The first data area 35a of the first layer (Layer 0) includes an inner spare area ISAO, a user data area 36a, and an outer spare area OSA0. The inner spare area ISAO has a fixed size (e.g., 2048 clusters) and the outer spare area OSA0 has a variable size. Here, the entire ISAO is used as a replacement area for linear replacement The OSA0 includes a replacement area 38d for linear replacement and a first IDMA 38a for storing therein IDMA information for defect management That is, an area for temporary defect management is not allocated to the inner spare area ISAO of the first layer (Layer 0). The second data area 35b of the second layer (Layer 1) includes an inner spare area ISA1, a user data area 36b, and an outer spare area OSA1. Each of the inner and outer spare areas ISA1 and OSA1 has a variable size. Each of the inner and outer spare areas ISA1 and OSA1 includes a replacement area 38f or 38g for linear replacement and an IDMA 38b or 38c for storing therein IDMA information for defect management In one example, the IDMAs 38a-38c are each allocated to a portion adjacent to the corresponding replacement area for linear replacement. The size of the IDMAs is allocated depending on the size of the spare areas ISA1, OSA0 and OSA1 where the spare areas ISA1, OSAO and OSA1 have a variable size. Here, the IDMAs 38a-38c are allocated within the spare areas depending on whether or not the corresponding spare areas area allocated. For instance, if a spare area is allocated to the BD-WO, then the corresponding IDMA may be allocated therein. But if a spare area is not allocated, then the corresponding IDMA may not be allocated therein and only the TDMA(s) having a fixed size may be allocated. In one example, if the BD-WO has been allocated with the ISAO and not with the ISA1, the OSAO and/or the OSA1, men only the first TDMA 37a may be allocated and the second TDMA 37b and the IDMAs 38a- 38c may not be allocated to the BD-WO. In another example, if the ISAO and ISA1 (and not the OSAO and OSA1) are allocated to the BD-WO, then the TDMAs 37a and 37b and the IDMA 38b (not the IDMAs 38a and 38c) may be allocated. In still another example, the IDMA may not be allocated within the corresponding spare area even if the corresponding spare area is allocated to the BD-WO. For instance, even if the ISAO, OSAO and OSA1 are allocated to the BD-WO, the corresponding IDMAs 38a and 38c may not be allocated therein. It should be noted that one or more of the ISAO, the OSAO (with or without the IDMA 38a), the OSA1 (with or without the IDMA 38c), and the ISA1 (with or without die IDMA 38b) may be allocated to the BD-WO with one or more of the TDMAs. The size of the IDMAs may depend on the size of the spare areas ISA1, OSAO and OSA1. For example, the size of each of the outer spare areas OSAO and OSA1 is allocated to be N ' 256 clusters (0 ^ N ^ 32), and the size of the inner spare area ISA1 is allocated to be L ' 256 clusters (0 ^ L ^ 64). Then the size of each of the IDMAs 38a and 38c is allocated to be P ' 256 clusters and the size of the IDMA 38b is allocated to be Q 256 clusters, where P and Q are integers determined to be P = N/4 and Q = L/4. Here a method wherein the size of the IDMA having a variable size is allocated to be a quarter of the size of the corresponding outer/inner spare area can be used. As an example, if N = 32 (max), then the size of the outer spare areas OSAO and OSA1 in total is 16384 clusters and P = N/4 = 8. As a result, the size of the IDMAs 38a and 38c in total is 4096 clusters. And if L = 64 (max), the size of the inner spare area ISA1 is 16384 clusters and Q = L/4 =16. As a result, the size of the IDMA 38b is allocated to be 4096 clusters. According to this example, the total maximum size of the data areas (35a and 35b) of the BD- WO dual layer is 711206 clusters, the total maximum size of the spare areas (ISA 0, ISA1, OSAO and OSA1) of the BD-WO dual layer is 34816 clusters, the total maximum size of the IDMAs (38a-38c) is 8192 clusters, the total maximum size of the replacement areas (ISAO, 38d, 38f and 38g) within the spare areas is 26624 clusters, and the total size of the user data areas (36a and 36b) is 676390 clusters. As a result, the total capacity (size) of the replacement areas (ISAO, 38d, 38f and 38g) in the spare areas of the BD-WO dual layer corresponds to about 4% of the total recording capacity of the user data areas of the BD-WO dual layer. Here, the size of the IDMAs may vary depending on the size of the spare areas ISA1, OSAO and OSA1 considering that when a replacement area for linear replacement is allocated in the corresponding spare area, the size of the replacement area, the size of the IDMA(s) and the size of the spare area depend on one another. In contrast, the size of the inner track area (especially the TDMA positioned at each of the lead-in area and the lead-out area) has a fixed value. The arrows depicted in each of the areas shown in FIGS. 6 and 7 are examples of a data recording direction. According to the second embodiment as shown in FIGS. 6 and 7, if a defective area within the user data area is detected during a data writing operation of the BD-WO, the data written or to be written to the defective area is written to a replacement area of a spare area according to the linear replacement Information pertaining to the defective area and the replacement area and any other information is written onto the TDMA(s) and IDMA(s) allocated on specific areas of the disc. The same defect management information may be written to each of the TDMA(s) and IDMA(s). In the alternative, if the TDMA of a layer is full, men the IDMA(s) of the same or different layer may be used, or if an IDMA of a layer is full, then the IDMA(s) of the same or different layer or the TDMA(s) of the same or different layer may be used. According to the second embodiment, in the BD-WO single layer, the entire ISA may be used as the area for linear replacement, whereas a portion of the OSA may be used as the IDMA and the remaining portion (or another . portion) of the OSA may be used as the area for linear replacement, hi the BD- WO dual layer, the entire ISAO may be used as the area for linear replacement, whereas portions of the ISA1, OSAO and OSA1 may be used as the IDMA(s) and the remaining portions (or other portions) of the ISA1, OSAO and OSA1 may be used as die area for linear replacement FIG. 8 is an example of a block diagram of an optical disc recording/reproducing device 20 according to an embodiment of the present invention. The optical disc recording/reproducing device 20 includes an optical pickup 22 for writing/reading data to/from an optical recording medium 21, a servo unit 23 for controlling the pickup 22 to maintain a distance between an objective lens of the pickup 22 and the recording medium 21 and for tracking relevant tracks on the recording medium 21, a data processor 24 for processing and supplying input data to the pickup 22 for writing, and for processing data read from the recording medium 21, an interface 25 for exchanging data and/or commands with any external host 30, a memory or storage 27 for storing information and data therein including defect management data (e.g., TDMA information, IDMA information, DMA information, etc.) associated with the recording medium 21, and a microprocessor or controller 26 for controlling the operations and elements of the recording/reproducing device 20. Data to be written/read to/from the recording medium 21 may also be stored in the memory 27. All the components of the recording/reproducing device 20 are operatively coupled. The recording medium 21 is a recording medium of write-once type scuh as a BD-WO. Industrial applicability The methods of allocating spare areas, IDMA(s) and TDMA(s) on the BD-WO according to the embodiments of the present invention can be implemented by the recording/reproducing device 20 of FIG. 8 or any other suitable device/system. For instance, the microcomputer 26 can control allocating the size of the spare area(s), the IDMA(s), TDMA(s), etc. according to the above discussed embodiments. It can control varying the size of the spare area(s) as replacement writing operations are performed. It can control the process of writing replacement data to replacement areas of the spare areas in a replacement writing operation, and the process of writing defect management information to the IDMA(s), TDMA(s), and DMA(s). The process of allocating the spare area(s), IDMA(s), TDMA(s), etc. may occur as needed while the disc is being manufactured, or during or prior to data writing and/or replacement writing operations using the recording/reproducing device 20 or some other suitable device/system. It will be apparent to those skilled in the art that various modifications and variations can be made in me present invention without departing from the spirit or scope of the inventions. Thus, it is intended mat the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. WE CLAIM : 1. A method for allocating a spare area on a recording medium of write-once type, the recording medium comprising: a recording layer, the recording layer comprising a data area having a user data area and a spare area allocated thereon with a size of 0 to a predetermined maximum value and a non data area having a defect management area allocated thereon for storing defect management information when the recording medium is to be finalized, characterized in that the method comprises: allocating onto the non data area a temporary defect management area with a predetermined fixed size, the temporary defect management area for storing defect management information therein until the recording medium is finalized; and allocating onto the spare area a interim defect management area with one of variable sizes, the interim defect management area for storing defect management information until the recording medium is finalized. 2. The method as claimed in claim 1, wherein the spare area excluding the interim defect management area allocated functions as a replacement area for replacing a defective cluster of the user data area. 3. The method as claimed in claim 1, wherein the size of the interim defect management area depends on the size of the spare area. 4. The method as claimed in claim 1, wherein the size of the interim defect management area allocated is 0 if the size of the spare area is 0. 5. The method as claimed in claim 1, wherein the recording medium has a plurality of recording layers, each of which has a non data area onto which a temporary defect management area is allocated with the predetermined fixed size. 6. The method as claimed in claim 1, wherein the recording medium has a single recording layer onto which an inner spare area is allocated with a predetermined fixed size. 7. The method as claimed in claim 1, wherein the spare area is allocated with a size of N x 256 clusters where N is an integer = 0. 8. The method as claimed in claim 7, wherein N is an integer = 64. 9. The method as claimed in claim 1, wherein the recording medium has a first recording layer onto which a first inner spare area is allocated with a predetermined fixed size and a first outer spare area is allocated, and a second recording layer onto which a second inner spare area is allocated with a size of L x 256 clusters where L is an integer = 0 and a second outer spare area is allocated. 10. The method as claimed in claim 9, wherein each of the first and second outer spare areas is allocated to a size of N x 256 clusters where N is an integer = 0. 11. The method as claimed in claim 9, wherein the interim defect management area is allocated onto at least one of the second inner spare area, the first outer spare area and the second outer spare area. 12. The method as claimed in claim 9, wherein L is an integer = 64. 13. An apparatus for allocating a spare area on a recording medium of write- once type, the recording medium comprising a recording layer, the recording layer comprising a data area having a user data area and a spare area allocated thereon with a size of 0 to a predetermined maximum value and a non data area having a defect management area allocated thereon for storing defect management information when the recording medium is to be finalized, characterized in that the apparatus comprises: a controller (26) configured to allocate onto the non data area a temporary defect management area with a predetermined fixed size, the temporary defect management area for storing defect management information therein until the recording medium is finalized; and allocate onto the spare area a interim defect management area with one of variable sizes, the interim defect management area for storing defect management information until the recoding medium is finalized. 14. The apparatus as claimed in claim 13, wherein the controller (26) is configured to use the spare area excluding the interim defect management area as a replacement area for replacing a defective cluster of the user data area. 15. The apparatus as claimed in claim 13, wherein the controller (26) is configured to allocate the interim defect management area with a size of 0 if the size of the spare area is 0. 16. The apparatus as claimed in claim 13, wherein the recording medium has a plurality of recording layers, and the controller (26) is configured to allocate onto a non data area of each recording layer a temporary defect management area with the predetermined fixed size. 17. The apparatus as claimed in claim 13, wherein the recording medium has a single recording layer, and the controller (26) is configured to allocate onto the single recording layer an inner spare area with a predetermined fixed size. 18. The apparatus as claimed in claim 13, wherein the controller (26) is configured to allocate onto the data area the spare area with a size of N x 256 clusters where is an integer N = 0. 19. The apparatus as claimed in claim 13, wherein the recording medium has first and second recording layers, and the controller (26) is configured to allocate onto the first recording layer a first inner spare area with a predetermined fixed size and a first outer spare area, and allocate onto the second recording layer a second inner spare area with size of L x 256 clusters where L is an integer = 0 and a second outer spare area. 20. The apparatus as claimed in claim 19, wherein the controller (26) is configured to allocate each of the first and second outer spare areas with a size of N x 256 clusters where N is an integer = 0. 21. The apparatus as claimed in claimed 20, wherein the controller (26) is configured to allocate the interim defect management area onto at least one of the second inner spare area, the first outer spare area and the second outer spare area. 22. The apparatus as claimed in claim 19, wherein L is an integer = 64. 23. The apparatus as claimed in claim 13, comprising: a host (30) configured to transmit commands to the controller (26) via an interface (25). 24. A recording medium of write-once type, the recording medium comprising: a recording layer, the recording layer comprising a data area having a user data area and a spare area allocated thereon with a size of 0 to a predetermined maximum value and a non data area having a defect management area allocated thereon for storing defect management information when the recording medium is to be finalized, characterized in that the non data area onto which a temporary defect management area for storing defect management information therein until the recording medium is finalized is allocated with a predetermined fixed size; and the spare area onto which a interim defect management area for storing defect management information until the recording medium is finalized is allocated with one of variable sizes. 25. The recording medium as claimed in claim 24, wherein the spare area excluding the interim defect management area allocated functions as a replacement area for replacing a defective cluster of the user data area. 26. The recording medium as claimed in claim 24, wherein the size of the interim defect management allocated is 0 if the size of the spare area is 0. 27. The recording medium as claimed in claim 24, wherein the recording medium has a plurality of recording layers, each of which has a non data area onto which the temporary defect management area is allocated with the predetermined fixed size. 28. The recording medium as claimed in claim 24, wherein the recording medium has a single recording layer onto which an inner spare area is allocated with a predetermined fixed size. 29. The recording medium as claimed in claim 24, wherein the size of the spare area is N x 256 clusters where N is an integer = 0. 30. The recording medium as claimed in claim 24, wherein the recording medium has a first recording layer onto which a first inner spare area is allocated with a predetermined fixed size and a first outer spare area is allocated, and a second recording layer onto which a second inner spare area is allocated with a size of L x 256 clusters where L is an integer > 0. 31. The recording medium as claimed in claim 30, wherein the size of each of the first and second outer spare areas is N x 256 clusters where N is an integer = 0. 32. The recording medium as claimed in claim 30, wherein at least one of the second inner spare area, the first outer spare area and the second outer spare area comprises the interim defect management area. 33. The recording medium as claimed in claim 30, wherein L is an integer = 64. A write-once type optical disc and a method and apparatus for allocating a spare area on the write-once type optical disc are provided. The method includes allocating a data area on a recording medium of write-once type, and allocating a user data area and at least one spare area within the data area on the recording medium, the at least one spare area having a variable size, wherein a maximum recording capacity of the at least one spare area on the recording medium is less than a maximum recording capacity of at least one variable spare area on a rewritable type optical disc.

Full Text

A METHOD AND APPARATUS FOR ALLOCATING A
SPARE AREA ON A RECORDING MEDIUM OF WRITE-
ONCE TYPE
Technical Field
The present invention relates to a method and apparatus for allocating a spare area on a
recording medium of write-once type and, generally relates to a write-once optical disc, and
more particularly, to an apparatus and method for allocating a spare area on a write-once
optical disc such as a write-once blu-ray disc.
Background Art
A new type of high-density optical disc such as a Blu-ray Disc Rewritable
(BD-RE) is being developed. A benefit of the BD-RE is that it has a rewritable
capability where the quality video and audio data can be written, erased and
rewritten thereon repeatedly.
FIG. 1 is a block diagram of a general optical disc device for
writing/reproducing data to/from an optical disc such as a BD-RE. As shown
in FIG. 1, the optical disc device includes an optical pickup 11 for
recording/reproducing a signal to/from a BD-RE 10, a video disc recorder
(VDR) system 12 for processing a signal from the optical pickup 11 as a
reproduced signal, or demodulating and processing an external data stream into a
writable signal suitable for writing onto the BD-RE 10, and an encoder 13 for
encoding an external analog signal and providing the encoded signal to the VDR
system 12.
FIG. 2 shows a structure of a general BD-RE. Referring to FIG. 2, an
LIA (lead-in area), a data area and an LOA (lead-out area) are allocated on the
BD-RE. An ISA (inner spare area) and an OSA (outer spare area) are allocated
separately to a front and a rear end of the data area. A user data area having an
LSN (Logical Sector Number) is allocated between the ISA and the OSA of the
data area.
Referring to FIGS. 1 and 2, the VDR system 12 writes input data from an
external source in a cluster unit corresponding ECC block having a
predetermined recording capacity after encoding and converting the input data
into a recording signal. The VDR system 12 also detects a defective area
within the data area when recording the data.
When a defective area is detected, the VDR system 12 performs a
replacement writing operation to write the cluster data from the defective area
onto the ISA instead. After the data writing is finished, location information of
the defective area and management information for reproducing the chaster data
written on the spare area (replacement area) are written as a defect list onto the
LIA.
FIGS. 3A and 3B illustrate a general structure of a BD-RE single layer
and a BD-RE dual layer, respectively. As shown, a BD-RE may have a single
recording layer (FIG. 3 A) or two recording layers (FIG. 3B).
Referring to FIG. 3A, the recording capacity of the inner spare area ISA
being allocated to the BD-RE single layer is 2048 clusters, and the recording
capacity of the outer spare area OSA is N x 256 (0= maximum of 16384 clusters. The recording capacity of the data area of the
BD-RE single layer is 355603 clusters. The recording capacity of the user data
area of the BD-RE single layer is determined to be a difference between the
recording capacity of the data area and the recording capacity of the spare areas.
For example, when the recording capacity of the outer spare area is 16384
clusters (N=64), then the recording capacity of the user data area is 337171
clusters. As a result, the size of the inner and outer spare areas (18432 = 2048
+ 16384) corresponds to 5.5% of the size of the user data area of the BD-RE
single layer.
Referring to FIG. 3B, in the BD-RE dual layer, the recording capacity of
the inner spare area (ISAO) of a first layer (Layer 0) is 2048 clusters. The
recording capacity of the outer spare area (OSA0) of the first layer is N x 256
clusters (0= hand, the recording capacity of the inner spare area (ISA1) of a second layer
(Layer 1) is L x 256 clusters (0= (L=64). The recording capacity of the outer spare area (OSA1) of the second
layer is N x 256 clusters (0= As a result, the total recording capacity of the spare areas of the first and second
layers is calculated to be 5.1% of the total recording capacity of the user data
areas of the first and second layers.
A Blu-ray Disc Write-Once (BD-WO) is another type of high density
optical disc that is being developed where a high quality of data can be recorded
and reproduced to and from the disc. As the name may suggest, data can be
written only once on the BD-WO and is not rewritable on the BD-WO. But the
BD-WO can be read repeatedly. As a result, the BD-WO is useful where the
rewritability of data on a recording medium is not desired.
Recently, standardizing the size of the BD-WO is being considered But
allocating the spare areas of the BD-WO as in the BD-RE would cause a
problem of wasting precious recording space due to the characteristics of the
BD-WO. For instance, in the BD-RE the recording capacity of the spare areas
should be allocated large enough since the BD-RE re-records data repeatedly
and as a result many defective areas can surface. In contrast, BD-WO is able to
write once and thus relatively less defective areas may be present Therefore, it
is not necessary and is wasteful to allocate the same amount of spare area of the
BD-RE onto the BD-WO.
Disclosure of Invention
Accordingly, the present invention is directed to an apparatus and method
for allocating a spare area of a write-once optical disc that substantially obviate
one or more problems due to limitations and disadvantages of a related art
An object of the present invention is to provide a write-once optical disc
and a method and apparatus for optimally allocating the spare area on the write-
once optical disc in consideration of the characteristics of the optical disc.
Additional advantages, objects, and features of the invention will be set
forth in part in the description which follows and in part will become apparent to
those having ordinary skill in the art upon examination of the following or may
be learned from practice of the invention. The objectives and other advantages of
the invention may be realized and attained by the structure particularly pointed
out in the written description and claims hereof as well as the appended
drawings.
To achieve these objects and other advantages and in accordance with the
purpose of the invention, as embodied and broadly described herein, a method
for allocating a spare area on a recording medium of write-once type according
to an aspect of the invention includes allocating a data area on the recording
medium; and allocating a user data area and at least one spare area within the
data area on the recording medium, the at least one spare area having a variable
size, wherein a maximum recording capacity of the at least one spare area on the
recording medium is less than a maximum recording capacity of at least one
variable spare area on a rewritable type optical disc.
In accordance with another aspect of the invention, a method for
allocating a spare area on a recording medium of write-once type, the recording
medium including at least one recording layer, includes allocating a data area on
the at least one recording layer of the recording medium; and allocating a user
data area and at least one spare area within the data area on the recording
medium, the at least one spare area having at least one replacement area, the at
least one replacement area having a variable size and constituting a part of the at
least one spare area or the entire at least one spare area, wherein a maximum
ratio of a size of the at least one replacement area to a size of the user data area
is less than about 5%.
In accordance with another aspect of the invention, an apparatus for
allocating a spare area on a recording medium of write-once type, includes a
combination of elements for allocating a data area on the recording medium and
for allocating a user data area and at least one spare area within the data area on
the recording medium, the at least one spare area having a variable size, wherein
a maximum recording capacity of the at least one spare area on the recording
medium is less than a maximum recording capacity of at least one variable spare
area on a rewritable type optical disc.
In accordance with another aspect of the invention, an apparatus for
allocating a spare area on a recording medium of write-once type, the recording
medium including at least one recording layer, includes a combination of
elements for allocating a data area on the at least one recording layer of the
recording medium and for allocating a user data area and at least one spare area
within the data area on the recording medium, the at least one spare area having
at least one replacement area, the at least one replacement area having a variable
size and constituting a part of the at least one spare area or the entire at least one
spare area, wherein a maximum ratio of a size of the at least one replacement
area to a size of the user data area is less than about 5%.
In accordance with an aspect of the invention, a recording medium of
write-once type includes a data area allocated on the recording medium, the data
area including a user data area and at least one spare area, the at least one spare
area having a variable size, wherein a maximum recording capacity of the at
least one spare area on the recording medium is less man a maximum recording
capacity of at least one variable spare area on a rewritable type optical disc.
In accordance with another aspect of the invention, a recording medium
of write-once type includes at least one recording layer; and a data area allocated
on the at least one recording layer, the data area including a user data area and at
least one spare area, the at least one spare area having at least one replacement
area, the at least one replacement area having a variable size and constituting a
part of the at least one spare area or the entire at least one spare area, wherein a
maximum ratio of a size of the at least one replacement area to a size of the user
data area is less than about 5%.
It is to be understood that both the foregoing general description and the
following detailed description of me present invention are exemplary and
explanatory and are intended to provide further explanation of the invention as
claimed.
Brief Description of the Accompanying Drawings
The accompanying drawings, which are included to provide a further
understanding of the invention and are incorporated in and constitute a part of
mis application, illustrate embodiments of the invention and together with the
description serve to explain the principle of the invention. In the drawings:
FIG. 1 illustrates a general optical disc device schematically;
FIG. 2 illustrates a structure of a general BD-RE;
FIGS. 3A and 3B illustrate a structure of a BD-RE single layer and a
general BD-RE dual layer, respectively;
FIG. 4 illustrates a structure of a BD-WO single layer and a method of
allocating a spare area on the BD-WO single layer according to a first preferred
embodiment of the present invention;
FIG. S illustrates a structure of a BD-WO dual layer and a method of
allocating a spare area on the BD-WO dual layer according to the first preferred
embodiment of the present invention;
FIG. 6 illustrates a structure of a BD-WO single layer and a method of
allocating a spare area on the BD-WO single layer according to a second
preferred embodiment of the present invention;
FIG. 7 illustrates a structure of a BD-WO dual layer and a method of
allocating a spare area on the BD-WO dual layer according to the second
preferred embodiment of the present invention; and
FIG. 8 is a block diagram of an optical disc recording/reproducing device
according to an embodiment of me present invention.
Best mode for Carrying Out the Invention
Reference will now be made in detail to the preferred embodiments of the
present invention, examples of which are illustrated in the accompanying
drawings. Wherever possible, the same reference numbers will be used
throughout me drawings to refer to the same or like parts.
Hereinafter, the embodiments of the method of allocating a spare area on
a write-once type optical disc such as BD-WO are explained in details according
to the present invention in reference with drawings. The present method can be
applied in the process of manufacturing a write-once BD-WO single layer and a
write-once ED-WO dual layer. Considering the characteristics of data
recording on the BD-WO, die maximum size of the spare area can be allocated
which is smaller man the maximum size of the spare areas allocated to a BD-RE.
In the present invention, the recording capacity of the spare
area(s)/replacement area(s) of a BD-WO is kept at less than about 5% of the
recording capacity of the user data area. In the present application, the
recording size of an area (assuming with no defects) means the size of the area.
As such, these two terms are interchangeably used herein. As an example only,
an embodiment of allocating the recording capacity of the spare area(s) to about
3% of the recording capacity of the user data area on the BD-WO will be now
explained as follows.
FIG. 4 illustrates a structure of a BD-WO single layer and a method of
allocating a spare area thereon according to a first embodiment of the present
invention.
Referring to FIG. 4, the BD-WO single layer includes a single recording
layer allocated with an LIA, a data area and an LOA. The data area includes a
user data area having a logical sector number (LSN), and an inner spare area
and/or an outer spare area for writing data of defective areas (i.e., as a
replacement area). The recording capacity of the inner spare area (ISA) is
allocated to be of a predetermined fixed value (e.g., 2048 clusters), and the
recording capacity of the outer spare area (OSA) is variable, e.g., N x 256
clusters (0= The recording capacity of the data area of the BD-WO single layer is
allocated to have 355603 clusters. The recording capacity of the user data area
is obtained by subtracting the recording capacity of the spare areas (ISA and
OSA) from the recording capacity of the data area. For example, when the
recording capacity of the outer spare area OSA is at the maximum 8192 clusters
(N=32), the recording capacity of the user data area is calculated to be 34563
(=355603-(2048+8192)) clusters. As a result, the recording capacity of the
inner and outer spare areas (10240 = 2048+8192) of the BD-WO single layer
according to this embodiment is about 3% of the recording capacity (size) of the
user data area (345 63 clusters) of the BD-WO single layer.
Accordingly, when the recording capacity of the inner and outer spare
areas allocated to the BD-WO single layer is adjusted to be about 3% of the
recording capacity of the user data area by varying the maximum recording
capacity of the outer spare area, the spare areas of the BD-WO are prevented
from being wasted and are efficiently allocated
FIG. 5 illustrates a structure of a BD-WO dual layer and a method of
allocating a spare area thereon according to the first embodiment of the present
invention.
Referring to FIG. 5, the BD-WO dual layer includes a first recording
layer (Layer 0) and a second recording layer (Layer 1). The first recording
layer (Layer 0) includes a LIA, a data area 32a, and an outer zone area (Outer
Zone 0). The data area 32a includes an inner spare area (ISA0), a user data
area 33a, and an outer spare area (OSA0). The second recording layer (Layer
1) includes a LOA, a data area 32b, and an outer zone area (Outer Zone 1). The
data area 32b of the second layer includes an inner spare area (ISA1), a user data
area 33b, and an outer spare area (OSA1). A data writing operation occurs
generally in the direction shown with the dotted arrow A.
The inner spare area (ISA0) on the first layer has a predermined fixed
size, e.g., 2048 clusters. The recording capacity of me outer spare area (OSAO)
on 1he first layer is variable and is N x 256 clusters (0= maximum 4096 clusters (N=16). The recording capacity of the inner spare area
(ISA1) on the second layer is variable and is L x 256 clusters (0= the maximum 8192 clusters (L-32). The recording capacity of the outer spare
area (OSA1) on the second layer is variable and is N x 256 clusters (0=s with the maximum 4096 clusters (N=16). The total recording capacity of the
first and second data areas 32a and 32b is 711206 (- 355603 x 2) clusters.
The total recording capacity of the user data areas on the first and second
layers is calculated by subtracting the total recording capacity of the spare
areas from the total recording capacity of the data areas of the first and second
layers. For example, if bom recording capacities of the first and second outer
areas (OSA0 and OSA1) are at maximum 4096 clusters (N=16) and the
recording capacity of the inner spare area (OSA1) of the second layer is at
maximum 8192 clusters (L=32), then the total recording capacity of the user data
areas of the first and second layers becomes 692774 clusters ( =(355603 x 2)-
(2048+4096+4096+8192)). As a result, the total capacity of the spare areas of
the first and second layers (2048+4096+4096+8192 clusters) corresponds to
about 3% of the total recording capacity of the user data areas cu the first and
second layers.
Accordingly, the total recording capacity of the first and second inner and
outer spare areas allocated to the BD-WO dual layer becomes about 3% of the
total recording capacity of the user data areas by adjusting the maximum
recording capacity of the first and second outer spare areas (OSA0, OSA1) and
the maximum recording capacity of the second inner spare area (ISA1).
Therefore, the spare areas are prevented from being wasted and are efficiently
allocated in accordance with the data recording characteristics of the BD-WO.
In the first embodiment as shown in FIGS. 4 and 5, the entire spare areas
(e.g., toner spare areas and outer spare areas) are used as replacement areas for
storing data of defective areas according to a linear replacement scheme. For
instance, if a cluster area of a user data area is found to be defective, then the
data stored in that defective cluster area is also written onto a spare area
functioning as a replacement area for the defective cluster area.
FIG. 6 shows a structure a BD-WO single layer and a method for
assigning a spare area on the BD-WO single layer according to a second
embodiment of the present invention. The BD-WO single layer shown in FIG.
6 includes a lead-in area, a data area, and a lead-out area. The data area has a
fixed size, e.g., 355603 clusters.
The lead-in area includes first and second defect management areas
DMA1 and DMA2, and a temporary defect management area TDMA. TDMA
is an area to temporarily record and manage defect management information of
the BD-WO until the BD-WO is finalized For instance, if during a writing
operation of the user data area, if data in a defective cluster area of the user data
area is written onto a part (replacement area) of a spare area according to a linear
replacement scheme, then information (e.g., location information, size, etc.) of
the defective cluster area and the corresponding replacement area within the
spare area is temporarily stored in the TDMA as TDMA information. Then if
the BD-WO is to be finalized (e.g., upon completion of the data writing onto the
user data area), then the TDMA information stored in the TDMA is transferred
to one or each of the DMAs allocated on the BD-WO. In this example, the
TDMA provided in the lead-in area has a fixed size, for example, 2048 clusters.
The data area includes an inner spare area ISA, a user data area 34, and
an outer spare area OSA. In this example, the entire inner spare area ISA is
used as an area for linear replacement (i.e., as a replacement area). In other
words, an area for temporary defect management is not allocated to the inner
spare area ISA. Generally, the ISA has a fixed size (e.g., 2048 clusters) and the
OSA has a variable size.
The outer spare area OSA includes an interim defect management area
(IDMA) and a replacement area 40 for linear replacement In one example, the
IDMA is allocated adjacent to the replacement area 40. The size of the IDMA
is allocated variably depending on the size of the outer spare area OSA. Since
the outer spare area OSA has a variable size, the IDMA also has a variable size.
Here, the IDMA is distinguished from the TDMA having a fixed size in
the lead-in area in that it has a variable size and may differ from the TDMA
depending on a usage manner in recorded timing. However, the TDMA and the
IDMA can store the same contents despite the difference between the terms.
This will be described later.
In one example, the IDMA having a variable size is allocated within the
outer spare area OSA depending on whether or not the outer spare area OSA is
allocated. For instance, if the outer spare area OSA is allocated, then the
IDMA is allocated therein as discussed herein. But if the outer spare area OSA
is not allocated, then the IDMA may not be allocated and only the TDMA
having a fixed size may be allocated as discussed herein, kt another variation,
the outer spare area OSA may be allocated without the allocation of the IDMA
therein. However, if the outer spare area OSA is allocated, it is preferable to
allocate the IDMA therein.
The size of the IDMA positioned at the outer track of the disc depends on
the variable size of the outer spare area OSA. In one example, the size of the
outer spare area OSA is N ' 256 clusters (0 = N = 64). In this case, the
size of the IDMA can be P ' 256 clusters, where P is an integer determined to
be P = N/4. That is, a method wherein the size of the IDMA is allocated to be a
quarter of the size of the outer spare area OSA can be used in determining the
size of the IDMA. For example, if N = 64 is used, then the size of the outer
spare area OSA is allocated to be 16384 clusters (16384 = 64 x 256) and P = N/4
= 16. As a result, the size of the IDMA according to the present invention is
allocated to be 4096 clusters (4096 = 16 x 256).
Similarly, the size of the IDMA may be varied depending on the size of
the outer spare area OSA considering that when the replacement area for linear
replacement is allocated in the OSA, the size of the replacement area, the size of
the DMA, and the size of the spare area(s) depend on one another. In contrast,
the size of the disk inner track area (especially the size of the TDMA positioned
in the lead-in area) has a fixed value.
FIG. 7 illustrates a structure of a BD-WO dual layer and a method of
allocating a spare area on the BD-WO dual layer according to the second
embodiment of the present invention.
Referring to FIG. 7, the BD-WO dual layer includes a first layer (Layer
0) and a second layer (Layer 1). The first layer (Layer 0) includes a lead-in
area, a data area 35a and an outer zone area Outer Zone 0. The second layer
(Layer 1) includes a lead-out area, a data area 35b and an outer zone area Outer
Zonel.
In each of the lead-in area and lead-out area, a TDMA of the present
invention is provided as first and second TDMAs 37a and 37b, and a plurality of
DMAs are provided. A plurality of DMAs are also provided in each of the
Outer Zones 0 and 1. Each TDMA provided in the lead-in area and the lead-
out area has a fixed size, for example, 2048 clusters.
The first data area 35a of the first layer (Layer 0) includes an inner spare
area ISAO, a user data area 36a, and an outer spare area OSA0. The inner spare
area ISAO has a fixed size (e.g., 2048 clusters) and the outer spare area OSA0
has a variable size. Here, the entire ISAO is used as a replacement area for linear
replacement The OSA0 includes a replacement area 38d for linear replacement
and a first IDMA 38a for storing therein IDMA information for defect
management That is, an area for temporary defect management is not
allocated to the inner spare area ISAO of the first layer (Layer 0).
The second data area 35b of the second layer (Layer 1) includes an inner
spare area ISA1, a user data area 36b, and an outer spare area OSA1. Each of
the inner and outer spare areas ISA1 and OSA1 has a variable size. Each of the
inner and outer spare areas ISA1 and OSA1 includes a replacement area 38f or
38g for linear replacement and an IDMA 38b or 38c for storing therein IDMA
information for defect management In one example, the IDMAs 38a-38c are
each allocated to a portion adjacent to the corresponding replacement area for
linear replacement. The size of the IDMAs is allocated depending on the size
of the spare areas ISA1, OSA0 and OSA1 where the spare areas ISA1, OSAO
and OSA1 have a variable size.
Here, the IDMAs 38a-38c are allocated within the spare areas depending
on whether or not the corresponding spare areas area allocated. For instance, if
a spare area is allocated to the BD-WO, then the corresponding IDMA may be
allocated therein. But if a spare area is not allocated, then the corresponding
IDMA may not be allocated therein and only the TDMA(s) having a fixed size
may be allocated. In one example, if the BD-WO has been allocated with the
ISAO and not with the ISA1, the OSAO and/or the OSA1, men only the first
TDMA 37a may be allocated and the second TDMA 37b and the IDMAs 38a-
38c may not be allocated to the BD-WO. In another example, if the ISAO and
ISA1 (and not the OSAO and OSA1) are allocated to the BD-WO, then the
TDMAs 37a and 37b and the IDMA 38b (not the IDMAs 38a and 38c) may be
allocated. In still another example, the IDMA may not be allocated within the
corresponding spare area even if the corresponding spare area is allocated to the
BD-WO. For instance, even if the ISAO, OSAO and OSA1 are allocated to the
BD-WO, the corresponding IDMAs 38a and 38c may not be allocated therein.
It should be noted that one or more of the ISAO, the OSAO (with or without the
IDMA 38a), the OSA1 (with or without the IDMA 38c), and the ISA1 (with or
without die IDMA 38b) may be allocated to the BD-WO with one or more of the
TDMAs.
The size of the IDMAs may depend on the size of the spare areas ISA1,
OSAO and OSA1. For example, the size of each of the outer spare areas OSAO
and OSA1 is allocated to be N ' 256 clusters (0 ^ N ^ 32), and the size of
the inner spare area ISA1 is allocated to be L ' 256 clusters (0 ^ L ^ 64).
Then the size of each of the IDMAs 38a and 38c is allocated to be P ' 256
clusters and the size of the IDMA 38b is allocated to be Q 256 clusters, where
P and Q are integers determined to be P = N/4 and Q = L/4. Here a method
wherein the size of the IDMA having a variable size is allocated to be a quarter
of the size of the corresponding outer/inner spare area can be used.
As an example, if N = 32 (max), then the size of the outer spare areas
OSAO and OSA1 in total is 16384 clusters and P = N/4 = 8. As a result, the
size of the IDMAs 38a and 38c in total is 4096 clusters. And if L = 64 (max),
the size of the inner spare area ISA1 is 16384 clusters and Q = L/4 =16. As a
result, the size of the IDMA 38b is allocated to be 4096 clusters. According to
this example, the total maximum size of the data areas (35a and 35b) of the BD-
WO dual layer is 711206 clusters, the total maximum size of the spare areas
(ISA 0, ISA1, OSAO and OSA1) of the BD-WO dual layer is 34816 clusters, the
total maximum size of the IDMAs (38a-38c) is 8192 clusters, the total maximum
size of the replacement areas (ISAO, 38d, 38f and 38g) within the spare areas is
26624 clusters, and the total size of the user data areas (36a and 36b) is 676390
clusters. As a result, the total capacity (size) of the replacement areas (ISAO,
38d, 38f and 38g) in the spare areas of the BD-WO dual layer corresponds to
about 4% of the total recording capacity of the user data areas of the BD-WO
dual layer.
Here, the size of the IDMAs may vary depending on the size of the spare
areas ISA1, OSAO and OSA1 considering that when a replacement area for
linear replacement is allocated in the corresponding spare area, the size of the
replacement area, the size of the IDMA(s) and the size of the spare area depend
on one another. In contrast, the size of the inner track area (especially the
TDMA positioned at each of the lead-in area and the lead-out area) has a fixed
value.
The arrows depicted in each of the areas shown in FIGS. 6 and 7 are
examples of a data recording direction.
According to the second embodiment as shown in FIGS. 6 and 7, if a
defective area within the user data area is detected during a data writing
operation of the BD-WO, the data written or to be written to the defective area is
written to a replacement area of a spare area according to the linear replacement
Information pertaining to the defective area and the replacement area and any
other information is written onto the TDMA(s) and IDMA(s) allocated on
specific areas of the disc. The same defect management information may be
written to each of the TDMA(s) and IDMA(s). In the alternative, if the TDMA
of a layer is full, men the IDMA(s) of the same or different layer may be used, or
if an IDMA of a layer is full, then the IDMA(s) of the same or different layer or
the TDMA(s) of the same or different layer may be used.
According to the second embodiment, in the BD-WO single layer, the
entire ISA may be used as the area for linear replacement, whereas a portion of
the OSA may be used as the IDMA and the remaining portion (or another
. portion) of the OSA may be used as the area for linear replacement, hi the BD-
WO dual layer, the entire ISAO may be used as the area for linear replacement,
whereas portions of the ISA1, OSAO and OSA1 may be used as the IDMA(s)
and the remaining portions (or other portions) of the ISA1, OSAO and OSA1
may be used as die area for linear replacement
FIG. 8 is an example of a block diagram of an optical disc
recording/reproducing device 20 according to an embodiment of the present
invention. The optical disc recording/reproducing device 20 includes an optical
pickup 22 for writing/reading data to/from an optical recording medium 21, a
servo unit 23 for controlling the pickup 22 to maintain a distance between an
objective lens of the pickup 22 and the recording medium 21 and for tracking
relevant tracks on the recording medium 21, a data processor 24 for processing
and supplying input data to the pickup 22 for writing, and for processing data
read from the recording medium 21, an interface 25 for exchanging data and/or
commands with any external host 30, a memory or storage 27 for storing
information and data therein including defect management data (e.g., TDMA
information, IDMA information, DMA information, etc.) associated with the
recording medium 21, and a microprocessor or controller 26 for controlling the
operations and elements of the recording/reproducing device 20. Data to be
written/read to/from the recording medium 21 may also be stored in the memory
27. All the components of the recording/reproducing device 20 are operatively
coupled. The recording medium 21 is a recording medium of write-once type
scuh as a BD-WO.
Industrial applicability
The methods of allocating spare areas, IDMA(s) and TDMA(s) on the
BD-WO according to the embodiments of the present invention can be
implemented by the recording/reproducing device 20 of FIG. 8 or any other
suitable device/system. For instance, the microcomputer 26 can control
allocating the size of the spare area(s), the IDMA(s), TDMA(s), etc. according to
the above discussed embodiments. It can control varying the size of the spare
area(s) as replacement writing operations are performed. It can control the
process of writing replacement data to replacement areas of the spare areas in a
replacement writing operation, and the process of writing defect management
information to the IDMA(s), TDMA(s), and DMA(s). The process of
allocating the spare area(s), IDMA(s), TDMA(s), etc. may occur as needed while
the disc is being manufactured, or during or prior to data writing and/or
replacement writing operations using the recording/reproducing device 20 or
some other suitable device/system.
It will be apparent to those skilled in the art that various modifications
and variations can be made in me present invention without departing from the
spirit or scope of the inventions. Thus, it is intended mat the present invention
covers the modifications and variations of this invention provided they come
within the scope of the appended claims and their equivalents.
WE CLAIM :
1. A method for allocating a spare area on a recording medium of write-once
type, the recording medium comprising:
a recording layer, the recording layer comprising a data area having a user
data area and a spare area allocated thereon with a size of 0 to a predetermined
maximum value and a non data area having a defect management area
allocated thereon for storing defect management information when the recording
medium is to be finalized,
characterized in that the method comprises:
allocating onto the non data area a temporary defect management area
with a predetermined fixed size, the temporary defect management area for
storing defect management information therein until the recording medium is
finalized; and
allocating onto the spare area a interim defect management area with one
of variable sizes, the interim defect management area for storing defect
management information until the recording medium is finalized.
2. The method as claimed in claim 1, wherein the spare area excluding the
interim defect management area allocated functions as a replacement area for
replacing a defective cluster of the user data area.
3. The method as claimed in claim 1, wherein the size of the interim defect
management area depends on the size of the spare area.
4. The method as claimed in claim 1, wherein the size of the interim defect
management area allocated is 0 if the size of the spare area is 0.
5. The method as claimed in claim 1, wherein the recording medium has a
plurality of recording layers, each of which has a non data area onto which a
temporary defect management area is allocated with the predetermined fixed
size.
6. The method as claimed in claim 1, wherein the recording medium has a
single recording layer onto which an inner spare area is allocated with a
predetermined fixed size.
7. The method as claimed in claim 1, wherein the spare area is allocated
with a size of N x 256 clusters where N is an integer = 0.
8. The method as claimed in claim 7, wherein N is an integer = 64.
9. The method as claimed in claim 1, wherein the recording medium has a
first recording layer onto which a first inner spare area is allocated with a
predetermined fixed size and a first outer spare area is allocated, and a second
recording layer onto which a second inner spare area is allocated with a size of L
x 256 clusters where L is an integer = 0 and a second outer spare area is
allocated.
10. The method as claimed in claim 9, wherein each of the first and second
outer spare areas is allocated to a size of N x 256 clusters where N is an integer
= 0.
11. The method as claimed in claim 9, wherein the interim defect
management area is allocated onto at least one of the second inner spare area,
the first outer spare area and the second outer spare area.
12. The method as claimed in claim 9, wherein L is an integer = 64.
13. An apparatus for allocating a spare area on a recording medium of write-
once type, the recording medium comprising a recording layer, the recording
layer comprising a data area having a user data area and a spare area allocated
thereon with a size of 0 to a predetermined maximum value and a non data area
having a defect management area allocated thereon for storing defect
management information when the recording medium is to be finalized,
characterized in that the apparatus comprises:
a controller (26) configured to allocate onto the non data area a temporary
defect management area with a predetermined fixed size, the temporary defect
management area for storing defect management information therein until the
recording medium is finalized; and allocate onto the spare area a interim defect
management area with one of variable sizes, the interim defect management
area for storing defect management information until the recoding medium is
finalized.
14. The apparatus as claimed in claim 13, wherein the controller (26) is
configured to use the spare area excluding the interim defect management area
as a replacement area for replacing a defective cluster of the user data area.
15. The apparatus as claimed in claim 13, wherein the controller (26) is
configured to allocate the interim defect management area with a size of 0 if the
size of the spare area is 0.
16. The apparatus as claimed in claim 13, wherein the recording medium has
a plurality of recording layers, and the controller (26) is configured to allocate
onto a non data area of each recording layer a temporary defect management
area with the predetermined fixed size.
17. The apparatus as claimed in claim 13, wherein the recording medium has
a single recording layer, and the controller (26) is configured to allocate onto the
single recording layer an inner spare area with a predetermined fixed size.
18. The apparatus as claimed in claim 13, wherein the controller (26) is
configured to allocate onto the data area the spare area with a size of N x 256
clusters where is an integer N = 0.
19. The apparatus as claimed in claim 13, wherein the recording medium has
first and second recording layers, and the controller (26) is configured to allocate
onto the first recording layer a first inner spare area with a predetermined fixed
size and a first outer spare area, and allocate onto the second recording layer a
second inner spare area with size of L x 256 clusters where L is an integer = 0
and a second outer spare area.
20. The apparatus as claimed in claim 19, wherein the controller (26) is
configured to allocate each of the first and second outer spare areas with a size
of N x 256 clusters where N is an integer = 0.
21. The apparatus as claimed in claimed 20, wherein the controller (26) is
configured to allocate the interim defect management area onto at least one of
the second inner spare area, the first outer spare area and the second outer
spare area.
22. The apparatus as claimed in claim 19, wherein L is an integer = 64.
23. The apparatus as claimed in claim 13, comprising:
a host (30) configured to transmit commands to the controller (26) via an
interface (25).
24. A recording medium of write-once type, the recording medium comprising:
a recording layer, the recording layer comprising a data area having a user
data area and a spare area allocated thereon with a size of 0 to a predetermined
maximum value and a non data area having a defect management area
allocated thereon for storing defect management information when the recording
medium is to be finalized,
characterized in that the non data area onto which a temporary defect
management area for storing defect management information therein until the
recording medium is finalized is allocated with a predetermined fixed size; and
the spare area onto which a interim defect management area for storing
defect management information until the recording medium is finalized is
allocated with one of variable sizes.
25. The recording medium as claimed in claim 24, wherein the spare area
excluding the interim defect management area allocated functions as a
replacement area for replacing a defective cluster of the user data area.
26. The recording medium as claimed in claim 24, wherein the size of the
interim defect management allocated is 0 if the size of the spare area is 0.
27. The recording medium as claimed in claim 24, wherein the recording
medium has a plurality of recording layers, each of which has a non data area
onto which the temporary defect management area is allocated with the
predetermined fixed size.
28. The recording medium as claimed in claim 24, wherein the recording
medium has a single recording layer onto which an inner spare area is allocated
with a predetermined fixed size.
29. The recording medium as claimed in claim 24, wherein the size of the
spare area is N x 256 clusters where N is an integer = 0.
30. The recording medium as claimed in claim 24, wherein the recording
medium has a first recording layer onto which a first inner spare area is allocated
with a predetermined fixed size and a first outer spare area is allocated, and a
second recording layer onto which a second inner spare area is allocated with a
size of L x 256 clusters where L is an integer > 0.
31. The recording medium as claimed in claim 30, wherein the size of each of
the first and second outer spare areas is N x 256 clusters where N is an integer =
0.
32. The recording medium as claimed in claim 30, wherein at least one of the
second inner spare area, the first outer spare area and the second outer spare
area comprises the interim defect management area.
33. The recording medium as claimed in claim 30, wherein L is an integer =
64.

A write-once type optical disc and a method and apparatus for allocating a spare
area on the write-once type optical disc are provided. The method includes allocating
a data area on a recording medium of write-once type, and allocating a user data
area and at least one spare area within the data area on the recording medium, the
at least one spare area having a variable size, wherein a maximum recording
capacity of the at least one spare area on the recording medium is less than a
maximum recording capacity of at least one variable spare area on a rewritable type
optical disc.

Documents:

1515-KOLNP-2005-FORM 27.pdf

1515-KOLNP-2005-FORM-27.pdf

1515-kolnp-2005-granted-abstract.pdf

1515-kolnp-2005-granted-assignment.pdf

1515-kolnp-2005-granted-claims.pdf

1515-kolnp-2005-granted-correspondence.pdf

1515-kolnp-2005-granted-description (complete).pdf

1515-kolnp-2005-granted-drawings.pdf

1515-kolnp-2005-granted-examination report.pdf

1515-kolnp-2005-granted-form 1.pdf

1515-kolnp-2005-granted-form 18.pdf

1515-kolnp-2005-granted-form 3.pdf

1515-kolnp-2005-granted-form 5.pdf

1515-kolnp-2005-granted-gpa.pdf

1515-kolnp-2005-granted-reply to examination report.pdf

1515-kolnp-2005-granted-specification.pdf

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Patent Number

234589

Indian Patent Application Number

1515/KOLNP/2005

PG Journal Number

24/2009

Publication Date

12-Jun-2009

Grant Date

10-Jun-2009

Date of Filing

02-Aug-2005

Name of Patentee

LG ELECTRONICS INC.

Applicant Address

20, YOIDO-DONG, YOUNGDUNGPO-GU, SEOUL 150-721, REPUBLIC OF KOREA.

Inventors:

#	Inventor's Name	Inventor's Address
1	KIM SUNG DAE	1110-1406, JUGONG APT., SANBON-DONG, GUNPO-SI GYEONGGI-DO
2	PARK YONG CHEOL	215-204, JUGONG APT. WONMUN-DONG, GWACHON-SI, GYEONGGI-DO
3	KIM SUNG DAE	1110-1406, JUGONG APT., SANBON-DONG, GUNPO-SI GYEONGGI-DO
4	PARK YONG CHEOL	215-204, JUGONG APT. WONMUN-DONG, GWACHON-SI, GYEONGGI-DO

PCT International Classification Number

G11B 7/00

PCT International Application Number

PCT/KR2003/002025

PCT International Filing date

2003-10-01

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	10-2003-0009895	2003-02-17	Republic of Korea
2	10-2003-0023876	2003-04-16	Republic of Korea