Write-once optical disc, and method and apparatus for allocating spare area on write-once optical disc

ES 2 333 010 T3

DESCRIPTION

One-time recordable optical disc, and method and apparatus for allocating a reserve area on a one-time recordable optical disc.

Technical field

The present invention relates to a one-time recordable optical disc, and more properly, to equipment and a method for allocating a spare area on a one-time recordable optical disc such as a one-time recordable blu-ray disc.

Background of the technique

A new type of high-density optical disc such as a Blu-ray Rewritable Disc (BD-RE) is currently being developed. An advantage of the BD-RE is that it has the ability to be re-recorded so that quality video and audio data can be repeatedly recorded, erased and re-recorded within it.

Figure 1 is a block diagram of a generic optical disc device for recording / reproducing data on / from an optical disc such as a BD-RE. As shown in Figure 1, the optical disc device includes an optical head 11 for recording / reproducing a signal on / from a BD-RE 10, a video disc recording (VDR) system 12 for processing an extracted signal of the optical head 11 in the form of a reproduced signal, or to demodulate and process an externally applied data stream and convert it into a recordable signal suitable to be recorded on the BD-RE 10, and an encoder 13 for encoding an externally applied analog signal and delivering the encoded signal to the VDR system 12.

Figure 2 shows a structure of a generic BD-RE. Referring to FIG. 2, an LIA (lead-in area), a data area, and a LOA (lead-out area) are assigned in the BD-RE. An ISA (inner spare area) and an OSA (outer spare area) are allocated separately at a front end and a rear end of the data area. A user data area having an LSN ("Logical Sector Number") is assigned between the ISA and the OSA of the data area.

Referring to Figures 1 and 2, the VDR 12 system writes input data extracted from an external source into an ECC block corresponding to a grouping unit that has a predetermined storage capacity after encoding and converting the input data into a recording sign. The VDR system 12 also detects a defective area within the data area when data is recorded.

When a bad area is detected, the VDR system 12 performs a replace write operation to write the bad area cluster data to the ISA in its place. After the data recording is finished, faulty area location information and management information are recorded to reproduce the grouping data recorded in the spare area (replacement area) as a defect list in the LIA.

Figures 3A and 3B illustrate a generic structure of a single-layer BD-RE and a double-layer BD-RE, respectively. As shown, a BD-RE can have a single recording layer (Figure 3A) or two recording layers (Figure 3B).

Referring to Figure 3A, the storage capacity of the internal ISA spare area allocated in the single layer of the BD-RE is 2,048 pools, and the storage capacity of the external OSA spare area is N x 256 (0 < N <64) clusters with a maximum of 16,384 clusters. The single layer BD-RE data area storage capacity is 355,603 pools. The storage capacity of the single-layer BD-RE user data area is determined as the difference between the storage capacity of the data area and the storage capacity of the spare areas. For example, if the storage capacity of the external spare area is 16,384 pools (N = 64), then the storage capacity of the user data area is 337,171 pools. As a result, the size of the internal and external reservation areas (18,432 = 2,048 + 16,384) corresponds to 5.5% of the size of the single-layer BD-RE user data area.

Referring to Figure 3B, in the double layer BD-RE, the storage capacity of the internal reserve area (ISA0) of a first layer (Layer 0) is 2,048 pools. The storage capacity of the outer spare area (OSA0) of the first layer is N x 256 pools (0 <N <32) with a maximum of 8,192 pools (N = 32). On the other hand, the storage capacity of the internal reserve area (ISA1) of a second layer (Layer 1) is L x 256 pools (0 <L <64) with a maximum of 16,384 pools (L = 64). The storage capacity of the external spare area (OSA1) of the second layer is N x 256 pools (0 <N <32) with a maximum of 8,192 pools (N = 32). As a result, the calculation of the total storage capacity of the reserve areas of the first and second layers gives a value of 5.1% of the total storage capacity of the user data areas of the first and second cap.

A Blu-ray One Time Recordable Disc (BD-WO) is another type of high-density optical disc that is being developed on which high-quality data can be recorded and played on and from the disc. As the name suggests, data can only be recorded once on the BD-WO and cannot be rewritten on the BD-WO. But nevertheless,

ES 2 333 010 T3 the BD-WO can be played repeatedly. As a result, the BD-WO is useful when you don't want the ability to rewrite data onto a recording medium.

Recently, the standardization of the size of BD-WO is being considered. However, allocating the BD-WO spare areas in the same way as BD-RE could cause the problem of wasting precious recording space due to the characteristics of the BD-WO. For example, the storage capacity of the spare areas in the BD-RE should be allocated large enough as the BD-RE repeatedly rewrites data and many bad areas can arise as a result. In contrast, a BD-WO is capable of being recorded only once and therefore relatively fewer defective areas may appear. Therefore, it is not necessary and wasteful to assign the same volume of spare area from BD-RE to BD-WO. Regarding the management of defective areas and reserve areas, reference is made to document EP-A-0350920, reflecting the preamble of the independent claims, JP-A-01-263955, US 2002/0097665 or DE-A- 1954054.

Description of the invention

The invention is specified by the claims.

Consequently, the present invention is directed toward equipment and a method for allocating a spare area of ​​a one-time recordable optical disk that substantially obviates one or more problems arising from the limitations and disadvantages of the related art.

An object of the present invention is to provide a one-time recordable optical disc and a method and equipment for optimally allocating the spare area on the one-time recordable optical disc taking into consideration the characteristics of the optical disc.

Additional advantages, purposes and features of the invention will be set forth in the description which follows, which will be appreciated in part by those of ordinary skill in the art upon examination of the following, or will be learned from practice of the invention. The objectives and other advantages of the invention will be realized and achieved by means of the structure particularly indicated in the written description and its claims as well as in the accompanying drawings.

In order to achieve these purposes and other advantages and in accordance with the purpose of the invention, as is broadly made and described herein, a method for allocating a reserve area on a one-time writeable type recording medium according to One 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, in which a maximum storage capacity of the at least one spare area on the recording medium is less than a maximum storage capacity of at least one variable spare area on a rewritable type optical disc.

According to another aspect of the invention, a method of allocating a reservation area on a one-time-writeable recording medium, 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 assigning 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 spare area having replacement area of ​​a variable size and constituting a part of the at least one reserve area or the whole of the at least one reserve area, wherein a maximum ratio between a size of the at least one replacement area and a size of the user data area is less than about 5%.

According to another aspect of the invention, equipment for allocating a reserve area on a one-time-writeable recording medium includes a combination of elements for allocating a data area on the recording medium and for allocating a recording area. user data 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 storage capacity of the at least one spare area on the recording medium is less than a maximum storage capacity of the at least one variable spare area on a rewritable type optical disk.

According to another aspect of the invention, an equipment for allocating a reservation area on a recording medium of the one-time recordable type, the recording medium including at least one recording layer, includes a combination of elements for assigning a recording area. data in 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 reserve 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 reserve area or the entirety of the at least one reserve area, wherein a maximum ratio between a size of the at least one replacement area and a size of the user data area is less than about 5%.

According to one aspect of the invention, a once-writeable type recording medium includes an allocated data area on the recording medium, the data area including a user data area and at least one spare area, having the at least one reserve area of ​​variable size, in which a maximum capacity of

ES 2 333 010 T3 storage of the at least one spare area on the recording medium is less than a maximum storage capacity of the at least one variable spare area on a rewritable type optical disk.

In accordance with another aspect of the invention, a once-writable type recording medium includes at least one recording layer; and an allocated data area in 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, having the at least one replacement area of ​​a variable size and constituting a part of the at least one reserve area or the entirety of the at least one reserve area, wherein a maximum ratio between a size of the at least one replacement area and a size of the user data area is less than about 5%.

It should be understood that both the above general description and the following detailed description of the present invention are offered by way of example and explanation and are intended to provide additional explanations of the invention as claimed.

Brief description of the drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated within and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the underlying principle of the invention. In the drawings:

Figure 1 schematically illustrates a generic optical disc device;

Figure 2 illustrates a structure of a generic BD-RE;

Figures 3A and 3B illustrate a structure of a single-layer BD-RE and a generic double-layer BD-RE, respectively;

Figure 4 illustrates a structure of a single-layer BD-WO and a method for allocating a spare area in the single-layer BD-WO according to a first preferred embodiment of the present invention;

Figure 5 illustrates a structure of a double-layer BD-WO and a method for allocating a spare area in the double-layer BD-WO according to the first preferred embodiment of the present invention;

Figure 6 illustrates a structure of a single-layer BD-WO and a method for allocating a spare area in the single-layer BD-WO according to a second preferred embodiment of the present invention;

Figure 7 illustrates a structure of a double-layer BD-WO and a method for allocating a spare area in the double-layer BD-WO according to the second preferred embodiment of the present invention; Y

Figure 8 is a block diagram of an optical disc recording / reproducing device in accordance with one embodiment of the present invention.

Best way to carry out the invention

Detailed reference will now be made to preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numerals are used throughout the drawings to refer to the same or like parts.

Hereinafter, embodiments of the method for allocating a spare area on a one-time writable optical disc such as a BD-WO are explained in detail according to the present invention with reference to the drawings. The present method can be applied in the manufacturing process of a single-layer one-time writable BD-WO and a double-layer one-time writable BD-WO. Considering the characteristics of data recording in the BDWO, the maximum size of the reserve area that must be allocated is less than the maximum size of the allocated reserve areas in a BD-RE.

In the present invention, the storage capacity of the spare area (s) / replacement area (s) of a BD-WO is kept at a value less than about 5% of the storage capacity of the spare area (s). User Data. In the present application, the recording size of an area (assuming it has no defects) means the size of the area. As such, these two terms are used interchangeably herein. As an example only, an embodiment to allocate the storage capacity of the spare area (s) to about 3% of the storage capacity of the user data area in the BD-WO will be explained below.

Figure 4 illustrates a structure of a single layer BD-WO and a method for allocating a spare area therein according to a first embodiment of the present invention.

Referring to FIG. 4, the single layer BD-WO includes a single recording layer assigned with an LIA, a data area, and a LOA. The data area includes a user data area that has a logical sector number

ES 2 333 010 T3 (LSN), and an internal reserve area and / or an external reserve area for recording defective area data (ie, as a replacement area). Internal spare area (ISA) storage capacity is assigned to have a fixed default value (for example, 2,048 pools), and external spare area (OSA) storage capacity is variable, for example, N x 256 clusters (0 <N <32) with a maximum of 8,192 clusters (N = 32).

The single layer BD-WO data area storage capacity is allocated to have 355,603 pools. The storage capacity of the user data area is obtained by subtracting the storage capacity of the reserve areas (ISA and OSA) from the storage capacity of the data area. For example, when the storage capacity of the external OSA spare area has its maximum value of 8,192 pools (N = 32), the storage capacity of the user data area is calculated as 34,563 pools (355,603 - (2,048 + 8,192) ). As a result, the storage capacity of the internal and external reserve areas (10,240 = 2,048 + 8,192) of the single-layer BD-WO according to this embodiment is about 3% of the storage capacity (size) of the single layer BD-WO user data area (34,563 clusters).

Consequently, when the storage capacity of the internal and external reserve areas allocated in the single-layer BD-WO is adjusted to be approximately 3% of the storage capacity of the user data area by varying the maximum capacity storage space of the external reserve area, the reserve areas of the BD-WO are prevented from being wasted and these areas are allocated efficiently.

Figure 5 illustrates a structure of a double-layer BD-WO and a method for allocating a reserve area therein according to the first embodiment of the present invention.

Referring to Figure 5, the dual-layer BD-WO includes a first recording layer (Layer 0) and a second recording layer (Layer 1). The first recording layer (Layer 0) includes an LIA, a data area 32a, and an outer zone area (Outer Zone 0). The data area 32a includes an internal spare area (ISA0), a user data area 33a, and an external 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 second layer data area 32b includes an internal spare area (ISA1), a user data area 33b, and an external spare area (OSA1). A data recording operation generally takes place in the direction shown by the dotted date A.

The internal reserve area (ISA0) in the first layer has a predetermined fixed size of, for example, 2,048 pools. The storage capacity of the external spare area (OSA0) in the first layer is variable and corresponds to N x 256 pools (0 <N <16) with a maximum of 4,096 pools (N = 16). The storage capacity of the internal reserve area (ISA1) in the second layer is variable and corresponds to L x 256 pools (0 <L <32) with a maximum of 8,192 pools (L = 32). The storage capacity of the external spare area (OSA1) in the second layer is variable and corresponds to N x 256 pools (0 <N <16) with a maximum of 4,096 pools (N = 16). The total storage capacity of the first 32a and second 32b data areas is 711,206 pools (= 355,603 x 2).

The total storage capacity of the user data areas in the first and second layers is calculated by subtracting the storage capacity of the spare areas from the total storage capacity of the data areas of the first and second layers. For example, if the storage capacity of both the first and second outer spare areas (OSA0 and OSA1) have their maximum value of 4,096 pools (N = 16) and the storage capacity of the inner spare area (ISA1) of the second layer has its maximum value of 8,192 clusters (L = 32), then the total storage capacity of the first and second layer user data areas turns out to be 692,774 pools (= (355,603 x 2) - (2,048 + 4,096 + 4,096 + 8,192)). As a result, the total capacity of the reserve areas of the first and second layers (2,048 + 4,096 + 4,096 + 8,192 pools) corresponds to approximately 3% of the total storage capacity of the user data areas in the first and the second layer.

Consequently, the total storage capacity of the first and second internal reserve areas and the first and second external reserve areas assigned to the double-layer BD-WO turns out to be approximately 3% of the total storage capacity of the areas. of user data, adjusting the maximum storage capacity of the first and second external reserve areas (OSA0, OSA1) and the maximum storage capacity of the second internal reserve area (ISA1). Accordingly, the spare areas are prevented from being wasted and such areas are allocated efficiently in accordance with the data recording characteristics of the BD-WO.

In the first embodiment as shown in Figures 4 and 5, all of the reserve areas (for example, the internal reserve areas and the external reserve areas) are used as replacement areas to store area data. defective according to a linear replacement scheme. For example, if a pool area of ​​a user data area is determined to be faulty, then the data stored in that bad pool area is also written to a spare area that functions as a replacement area for the user data area. faulty groupings.

ES 2 333 010 T3

Fig. 6 shows a structure of a single-layer BD-WO and a method for allocating a spare area in the single-layer BD-WO according to a second embodiment of the present invention. The single-layer BD-WO shown in Figure 6 includes an input area, a data area, and an output area. The data area has a fixed size, for example 355,603 clusters.

The input area includes first and second defect management areas DMA1 and DMA2, and a temporary defect management area TDMA ("temporary defect management area"). The TDMA is an area for temporarily recording and managing BD-WO defect management information until the BD-WO is finalized. For example, if during a user data area write operation, data from a bad pool area of ​​the user data area is written to a part (replacement area) of a spare area according to a replacement scheme linear, then the information (for example, location information, size, etc) of the bad group area and the corresponding replacement area within the reserve area is temporarily stored in the TDMA as TDMA information. So, if the BD-WO is about to be finalized (for example, after the data recording in the user data area is completed), then the TDMA information stored in the TDMA is transferred to one or each of the DMAs. assigned in the BD-WO. In this example, the TDMA arranged in the input area has a fixed size of, for example, 2,048 clusters.

The data area includes an internal reservation area ISA, a user data area 34, and an external output area OSA. In this example, the entire internal reservation area ISA is used as an area for linear replacement (that is, as a replacement area). In other words, a temporary defect management area is not allocated in the internal reserve area ISA. Generally, the ISA has a fixed size (for example, 2,048 pools) and the OSA has a variable size.

The external spare area OSA includes an interim defect management area (IDMA) and a substitution area 40 for linear substitution. In one example, the IDMA is assigned adjacent to the replacement area 40. The size of the IDMA is assigned variably depending on the size of the external OSA reservation area. Since the external spare area OSA has a variable size, the IDMA also has a variable size.

Here, IDMA is distinguished from TDMA which has a fixed size in the input area in that it has a variable size and may differ from TDMA depending on the mode of use in recording timing. However, TDMA and IDMA can store the same content despite the difference between the terms. This will be described later.

In one example, 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 example, if the external spare area OSA is allocated, then the IDMA within it is allocated as discussed herein. But if the external spare area OSA is not allocated, then the IDMA cannot be allocated and only the TDMA having a variable size could be allocated as discussed herein. In another variation, the external reserve area OSA can be assigned without the IDMA being assigned within it. However, if the external spare area OSA is allocated, it is preferable to allocate the IDMA within it.

The size of the IDMA positioned on the outer track of the disc depends on the variable size of the outer OSA spare area. In one example, the size of the OSA spare outer area is N x 256 pools (0 <N <64). In this case, the size of the IDMA could be P x ​​256 clusters, where P is an integer that is determined as P = N / 4. That is, a method in which the size of the IDMA is allocated to be one-fourth of the size of the outer spare area OSA can be used to determine the size of the IDMA. For example, if N = 64 is used, then the size of the external OSA reservation area is assigned to be 16,384 pools (16,384 = 64 x 256) and P = n / 4 = 16. As a result, the size of the IDMA According to the present invention it is assigned to be 4,096 clusters (4,096 = 16 x 256).

Similarly, the size of the IDMA can be varied depending on the size of the external reserve area OSA considering that when the replacement area is allocated for linear replacement in the OSA, the size of the replacement area, the size of the DMA, and the size of the reserve area (s) depend on each other. On the contrary, the size of the inner track area of ​​the disc (especially the size of the TDMA positioned in the input area) has a fixed size.

Fig. 7 illustrates a structure of a double-layer BD-WO and a method for allocating a spare area in the double-layer BD-WO according to the second embodiment of the present invention.

Referring to Figure 7, the double layer BD-WO includes a first layer (Layer 0) and a second layer (Layer 1). The first layer (Layer 0) includes an input area, a data area 35a, and an Outer Zone Area 0. The second layer (Layer 1) includes an output area, a data area 35b, and an Outer Zone Area 1.

In both the entry area and the exit area, a TDMA of the present invention is provided as a first TDMA 37a and a second TDMA 37b, and a plurality of DMAs are provided. A plurality of

ES 2 333 010 T3

DMAs in both External Zone 0 and External Zone 1. Each DMA arranged in the entrance area and in the exit area has a fixed size, for example, of 2,048 clusters.

The first data area 35a of the first layer (Layer 0) includes an internal spare area ISA0, a user data area 36a, and an external spare area OSA0. The internal spare area ISA0 has a fixed size (for example, 2,048 pools) and the external spare area OSA0 has a variable size. Here, the entire ISA0 is used as a substitution area for linear substitution. OSA0 includes an area 38d for linear replacement and a first IDMA 38a for storing IDMA information for defect management. That is, a temporary defect management area is not allocated in the internal reserve area ISA0 of the first layer (Layer 0).

The second data area 35b of the second layer (Layer 1) includes an internal spare area ISA1, a user data area 36b, and an external spare area OSA1. Both the internal reservation area ISA1 and the external reservation area OSA1 have a variable size. Both the internal spare area ISA1 and the external spare area OSA1 include replacement areas 38f and 38g for linear replacement and an IDMA 38b or 38c for storing IDMA information for defect management therein. In one example, each of the IDMAs 38a-38c are all assigned in a portion adjacent to the corresponding substitution area for linear substitution. The size of the IDMAs is assigned depending on the size of the reserve areas ISA1, OSA0 and OSA1, where the reserve areas ISA1, OSA0 and OSA1 have a variable size.

Here, the IDMAs 38a-38c are assigned within the reserve areas depending on whether or not the corresponding reserve areas are assigned. For example, if a reservation area is allocated in the BD-WO, then the corresponding IDMA can be allocated within it. But if a reserve area is not allocated, then the corresponding IDMA cannot be allocated within it and only the TDMA (s) that have a fixed size can be allocated. In one example, if ISA0 but not ISA1, OSA0 and / or OSA1 has been assigned in the BD-WO, then only the first TDMA 37a can be assigned and the second TDMA 37b and IDMAs 38a-38c cannot be assigned in the BD-WO. In another example, if ISA0 and ISA1 (but not OSA0 and OSA1) are assigned in the BD-WO, then TDMAs 37a and 37b (but not IDMAs 38a and 38c) can be assigned. In yet another example, the IDMA may not be assigned in the corresponding reservation area even if the corresponding reservation area is assigned in the BD-WO. For example, even if ISA0, OSA0 and OSA1 are assigned in the BD-WO, the corresponding IDMAs 38a and 38c might not be assigned there. It should be noted that one or more of ISA0, OSA0 (with or without IDMA 38a), OSA1 (with or without IDMA 38c) and ISA1 (with or without IDMA 38b) can be assigned in the BD-WO with one or more of the TDMAs.

The size of the IDMAs can depend on the size of the reserve areas ISA1, OSA0 and OSA1. For example, each of the outer spare areas OSA0 and OSA1 can be assigned to be N x 256 pools in size (0 <N <32), and the internal spare area ISA1 can be assigned to have a size of L x 256 clusters (0 <L <64). Then the size of both IDMA 38a and IDMA 38c is assigned to be P x ​​256 clusters and the size of IDMA 38b is assigned to be Q x 256 clusters, where P and Q are integers that are determined as P = N / 4 and Q = L / 4. Here a method can be used in which the size of the IDMA having a variable size is allocated to be one fourth of the size of the corresponding external / internal reservation area.

As an example, if N = 32 (maximum value), then the size of the external reserve areas OSA0 and OSA1 in total is 16,384 clusters and P = N / 4 = 8. As a result, the size of IDMAs 38a and 38c in total it is 4,096 groups. Furthermore, if L = 64 (maximum value), the size of the internal reservation area ISA1 is 16,384 pools and Q = L / 4 = 16. As a result, the IDMA 38b is allocated with a size of 4,096 pools. According to this example, the maximum total size of the data areas (35a and 35b) of the double layer BD-WO is 711,206 clusters, the maximum total size of the spare areas (ISA0, ISA1, OSA0 and OSA1) of the double-layer BD-WO is 34,816 clusters, the maximum total size of the IDMAs (38a-38c) is 8,192 clusters, the maximum total size of the substitution areas (ISA0, 38d, 38f and 38g) in the breast of the reserve areas is 26,624 groups, and the total size of the user data areas (36a and 36b) is 676,390 clusters. As a result, the total capacity (size) of the replacement areas (ISA0, 38d, 38f and 38g) in the reserve areas of the double-layer BD-WO corresponds to about 4% of the total storage capacity of the storage areas. user data on the double-layer BD-WO.

Here, the size of the IDMAs may vary depending on the size of the reserve areas ISA1, OSA0 and OSA1 considering that when a replacement area is assigned for linear replacement in the corresponding reserve area, the size of the replacement area, the size the IDMA (s) and the size of the reserve area depend on each other. In contrast, the size of the inner track area (especially the TDMA positioned in both the lead-in area and the lead-out area) has a fixed value.

The arrows depicted in each of the areas shown in Figures 6 and 7 are examples of the direction in which a data recording takes place.

According to the second embodiment as shown in Figures 6 and 7, if a defective area is detected within the user data area during a data recording operation on the BD-WO, the recorded data or to be recorded in the defective area are recorded in a replacement area of ​​a spare area according to the linear replacement. Information regarding the defective area and the replacement area and any other information is recorded in the TDMA (s) and IDMA (s) assigned in specific areas of the disc. The same management information

ES 2 333 010 T3 of defects can be recorded in each of the TDMA (s) and the IDMA (s). In the alternative option, if the TDMA of a layer is full, then the IDMA (s) of the same layer or of a different layer can be used, or if a IDMA of a layer is full, then you can (n) use the IDMA (s) from the same layer or from a different layer or the TDMA (s) from the same layer or from a different layer.

According to the second embodiment, in the single-layer BD-WO the whole of the ISA can be used as the area for linear substitution, while a portion of the OSA can be used as the IDMA and the remaining portion (or other portion ) of the OSA can be used as the area for linear substitution. In double-layer BD-WO, all of the ISA0 can be used as the area for linear substitution, while portions of the ISA1, OSA0, and OSA1 can be used as the IDMA (s) and the remaining portions (or other portions) of ISA1, OSA0, and OSA1 can be used as the area for linear substitution.

FIG. 8 is an example of a block diagram of a recording / reproducing device 20 in accordance with one embodiment of the present invention. The recording / reproducing device 20 includes an optical head 22 for recording / reading data to / from an optical recording medium 21, a servo unit 23 for controlling the optical head 22 in order to maintain a distance between an objective lens of the optical head 22 and the recording medium 21 and for tracking corresponding tracks in the recording medium 21, a data processor 24 for processing and providing input data to the optical head 22 for recording, and for processing data read from the recording medium 21, an interface 25 for exchanging data and / or instructions with an external server 30, a memory or storage medium 27 for storing information and data therein including defect management data (for example, 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. The data to be recorded / reproduced on / from the recording medium 21 can also be stored in the memory 27. All components of the recording / reproducing device 20 are operatively coupled. The recording medium 21 is a one-time recordable type recording medium such as a BD-WO.

Industrial applicability

The methods for allocating spare areas, IDMA (s) and TDMA (s) in the BD-WO according to the embodiments of the present invention may be implemented by the recording / reproducing device 20 of Figure 8 or by another device / system. appropriate. For example, the microcomputer 26 may control the allocation of the size of the reserve area (s), the IDMA (s), the TDMA (s), etc. in accordance with the embodiments discussed above. . You can control the variation in the size of the spare area (s) during the execution of replace write operations. You can control the process of recording replacement data in replacement areas of the reserve areas in a replacement recording operation, and the process of recording defect management information in IDMA (s), TDMA ( s), and DMA (s). The process of assigning spare area (s), IDMA (s), TDMA (s), etc. can take place as needed while the disc is being manufactured, or during or before data recording and / or replacement recording operations using the recording / reproducing device 20 or some other appropriate device / system.