KR20050037814A - Method for management of spare area on optical disc writable - Google Patents

Abstract

The present invention relates to a recordable optical disc and a method for managing a spare area of the optical disc, wherein in a recordable optical disc having at least one spare area and a management area, a new spare area is changed by varying the size of the spare area during use of the disc. And setting the current size information of the spare area changed by the change of the spare area in the management area, and through this, it becomes possible to establish a uniform standard for the structure of the spare area applicable to the recordable optical disc. In addition, there is an advantage that the use efficiency of the optical disk can be further increased.

Description

Method for management of spare area on optical disc writable

       The present invention relates to a recordable optical disc and a method for managing a spare area within the optical disc, and more particularly, to a method for managing a spare area when allocating and expanding or reducing the spare area.

As optical recording media, optical disks capable of recording large amounts of data are widely used. Recently, new high-density optical recording media (HD-DVD), for example, Blu-ray Disc, which can record and store high-quality video data and high-quality audio data for a long time, have been developed.

Blu-ray Disc, the next-generation HD-DVD technology, is a next-generation optical recording solution that can store data that significantly surpasses existing DVDs. Recently, world-standard technical specifications have been established.

In connection with the Blu-ray Disc, various standard proposals have been prepared. The rewritable Blu-ray Disc (BD-RE Version 1.0) is followed by the write-once Blu-ray Disc (BD-WO) and the next version of the rewritable Blu-ray Disc. Various standard proposals for (BD-RE Version 1.1 and above) are being prepared.

Fig. 1 schematically shows a recording area structure of a conventional rewritable Blu-ray Disc (BD-RE Ver1.0). The rewritable Blu-ray Disc (BD-RE) of Fig. 1 shows the structure of a recording area for a single layer disc having one recording layer, for example, and the lead-in when viewed from the inner circumference of the disc. It is shown that it is divided into a lead-in area, a data area, and a lead-out area. In the data area, an inner spare area ISA0 and an outer spare area OSA0 for replacing the defective area are provided inside and outside of the data area, respectively, with a user data area (User) for recording user data. Data Area) is provided.

If a defective area exists in the user data area while data is being recorded on the rewritable Blu-ray Disc BD-RE, the data recorded in the defective area is moved to the spare area for replacement and recording. Defect management is performed by recording position information related to the defective area and the replacement area in the defect management areas DMA1, 2, 3, and 4 provided in the lead-in / out area as management information on the defective area. In the case of Blu-ray Disc (BD), the minimum recording unit to be recorded on the disk is the minimum unit of cluster, one cluster is composed of 32 sectors in total, and one sector is composed of 2048 bytes. do.

In the case of the rewritable disc, since any area of the disc can be rewritten, not only a special recording method can be used, but also the entire area of the disc can be used at random, and the management information can be rewritten in the defect management area (DMA). Only the defect management area of a predetermined size may be provided. In particular, in the case of BD-RE, 32 clusters were allocated to each defect management area (DMA).

However, in a disc which can be written once, recording on a specific area of the disc can be performed only once, so that there are many limitations on the recording method, and in a high-density once-writable disc such as the recent BD-WO, data is recorded. Defect management has also become an important issue. Therefore, even in a disc that can be written once, a management area for recording defect management and disc management information is required. In the case of an optical disc that can be written once, an area for recording management information is rewritten by the characteristic of 'one time' of recording. It will require more than possible discs, and also requires more spare area than rewritable optical discs in order to enable defect management and (logical) overlapping recording functions, as with rewritable optical discs, even on a rewritable optical disc. something to do.

However, there is no spare area and defect management area in any of the currently published standards related to write once optical discs (eg CD-R, DVD-R, etc.). It would be necessary to have a complete standard that can be accommodated.

In addition, even if a rewritable Blu-ray Disc (BD-RE) does not need to add a management area, it is possible to increase the spare area if necessary so that user convenience can be achieved. This will need to be prepared as soon as possible.

Accordingly, the present invention has been made in view of the above circumstances, and provides a method of managing a spare area in a recordable optical disc and a recording and reproducing apparatus associated therewith, in particular, the size of the spare area is variably expanded or reduced. It is an object of the present invention to provide a method for recording management information that can enable and recognize a variable size of the spare area.

A spare area management method for a recordable optical disc according to the present invention for achieving the above object, in a recordable optical disc having at least one spare area and a management area, by changing the size of the spare area during use of the disc A spare area is set, and the current size information of the spare area changed by the change of the spare area is recorded in the management area.

Another spare area management method of a recordable optical disc of the present invention is a recordable optical disc having at least one spare area and a management area, wherein the spare area can be enlarged while the disc is in use, and a predetermined expansion unit is determined for each expansion. Expand by as much as possible, and record expansion count information of the spare area in a management area;

In the recordable optical disc according to the present invention, at least one spare area, a new spare area is set by varying the size of the spare area while the disc is in use, and the current size information of the spare area changed by the change of the spare area is recorded. Characterized by having a management area to

 In another recordable optical disc according to the present invention, at least one spare area and the size of the spare area can be expanded while the disc is in use, each time the expansion is made by a predetermined expansion unit, and the expansion count information of the spare area is expanded. Characterized by having a management area for recording,

The recording and reproducing apparatus of a recordable optical disc according to the present invention includes a control unit for determining whether a spare area size is variable, a new spare area is set by varying the size of the spare area according to the determination, and the current size of the variable spare area. And a recording and reproducing section for recording the information into the management area of the disc.

Another recording and reproducing apparatus of a recordable optical disc according to the present invention includes a control unit for determining whether a spare area is to be expanded or not, and when the spare area is required to be expanded according to the judgment, expand and expand by a predetermined expansion unit. And a recording / playback section for recording the number of times information into the management area of the disc.

 Hereinafter, a preferred embodiment of a management information recording method of a recordable optical disc according to the present invention will be described in detail with reference to the accompanying drawings. For convenience of explanation, a writeable optical disc will be described taking the case of a write once Blu-ray disc (BD-WO) as an example. However, the technical idea of the present invention will be equally applicable to rewritable optical discs.

      In addition, the terms used in the present invention was selected as a general term widely used as possible now, but in certain cases, the term is arbitrarily selected by the applicant, in which case the meaning is described in detail in the description of the invention, The present invention is to be understood as the meaning of terms rather than names.

      2 and 3 are detailed diagrams showing the structure of a write once Blu-ray optical disc (BD-WO) to which the present invention is applied. In particular, the write-once optical disc of the present invention is characterized by having a spare area for defect management, which will be described in detail in how the spare area is allocated in the disc.

FIG. 2 is a write-once optical disc (BD-WO) structure of the present invention, which relates to a single layer disc having one recording layer, compared with the conventional rewritable optical disc (BD-RE) described in FIG. In view of the above, the characteristic optical disc structure can be of the following two types.

Firstly, due to the characteristics of an optical disc that can be written once, a large number of areas for recording various types of management information on the disc must be secured. Therefore, a large number of temporary defect management areas other than the conventional defect management area (hereinafter referred to as "DMA") are provided. Management area, hereinafter referred to as " TDMA "). In particular, TDMA is largely divided into two types: first, a primary fault management area (hereinafter referred to as "PTDMA") having a fixed size (for example, 2048 cluster) within a lead-in area. Next, an auxiliary temporary defect management area (hereinafter referred to as "ATDMA") in the outer spare area OSA0 having a variable size among the spare areas in the data area is named PTDMA0 and ATDMA0, respectively. It was.

PTDMA0 must be allocated to the lead-in area with a fixed size (for example, 2048 cluster). ATDMA0 can be assigned selectively or not, and ATDMA0 can be variously determined. In comparison with the size A of the spare area OSA0, a specific ratio (for example, B = A / 4) may be appropriate. That is, the write-once optical disc of the present invention has a plurality of temporary defect management areas (TDMA) in addition to the defect management area (DMA), and has a PTDMA allocated to a fixed size and an ATDMA allocated to a specific spare area with a variable size. Characterized by having

Second, the size of the spare area can be set to be flexible. That is, setting the spare area variably means that the size of the initially allocated spare area can be expanded or reduced. This means that defect management is performed even though an optical disc is write once. In addition, additional functions (e.g., are related to logically superimposed recording on a BD-WO, which is not physically rewritable in a specific area, but are desired to be rewritten in a specific area that has already been recorded). This is because a large spare area is required in order to make the recording possible by replacing it with a spare area.

In addition, in the present invention, only the spare area existing at the end of the user data area can be changed in order to prevent confusion that occurs when all spare areas are flexibly operated. The spare area existing at the end of the user data area is the outer spare area OSA0 in the case of a single layer disk as shown in FIG. 2, and in the case of a dual layer disk as shown in FIG. It will be the inner spare area ISA1 of the second recording layer Layer1. That is, there is only one spare area that is flexibly managed in the entire disk, and the remaining spare areas have a variable size that is fixed at an initially allocated size and is later expanded or reduced.

In addition, the expansion of the spare area is allowed to expand up to a predetermined maximum expandable size to prevent indefinite expansion. For example, the preferred maximum extension size of the spare area is increased to 1/3 of the total data area. By allowing expansion, in the case of a single layer as shown in Fig. 2, the maximum size of the expandable spare area will be about 9GB. However, it will be apparent that the maximum scalable size can be set to another size during the specification process.

In addition, for convenience of explanation, the English alphabets (A, B, C, D, N, P, L, Q, X, Y, Z, K, etc.) indicating the respective disc areas are shown in FIG. 2 and below. It is to be noted that the information is displayed as information.

FIG. 3 shows a case of a dual layer having two recording layers to which the present invention is applied, wherein there is a first recording layer Layer0 and a second recording layer Layer1, each recording layer. There are PTDMA0 (Layer0) and PTDMA1 (Layer1) having a fixed size. A total of four spare areas can be allocated. ISA0 and OSA0 are allocated to the inner and outer peripheries of the first recording layer, ISA1 and OSA1 can be assigned to the Inner and Outer. In particular, ATDMA exists only in the dual OSA0 / OSA1 / ISA1, which is named ATDMA0 / ATDMA1 / ATDMA2, respectively. In addition, as described with reference to FIG. 2, the spare area that is dually variably operated may correspond only to the inner spare area ISA1 of the second recording layer existing at the end of the user data area, and is also expandable to a maximum expandable size. This prevents indefinite expansion. In FIG. 3, the English alphabets C, D, L, and Q are information representing the size of the corresponding area, respectively, in particular, the size (D) of ATDMA0 and ATDMA1 is about 1/4 of the size (C) of OSA0 and OSA1. Preferably, the size of ATDMA2 (Q) is about 1/4 of the size (L) of ISA1, but it will be apparent that it may have another size as determined by the specification.

Fig. 4 shows the types of management information recorded in the temporary defect management area (PTDMA or ATDMA) in the write once optical disc of the present invention, where the same management information will be recorded in PTDMA and ATDMA. For convenience, only management information recorded in PTDMA0 is shown.

There are three types of management information. First is the Temporary Defect List (TDFL), which records a defect list for managing the defective area of the disc. Second, the sequential recording range information (SRRI) that informs the recording status of the disc. And SBM (Space Bit Map), and the third is TDDS (Temporary Disc Definition Structure) for recording various necessary information on the disc. In particular, SRRI and SBM are not used at the same time, SRRI is recorded in the continuous recording method, and SBM is recorded in the random recording method. In addition, the management information will be recorded in the TDMA whenever an update is required, but the TDDS should always be updated with the latest TDFL or SRRI (or SBM). The information recorded in the TDDS may be, for example, the location information of the latest TDFL (or SRRI or SBM), and the "spare area size information" and / or "spare area expansion frequency", which will be described later in connection with the present invention. Information "and the like.

Hereinafter, a variable allocation method of the spare area of the present invention will be described with reference to FIGS. 5 to 11 through various embodiments.

In addition, for convenience of description, in the following embodiment, only the case of the single layer as shown in FIG. 2 is shown as an example, it will be apparent that the same can be applied to the case of the dual layer as shown in FIG. In this case, ISA1, not OSA0, is variably operated as described above.

5A to 5B relate to the method of the first embodiment for managing the spare area of the present invention, and relates to the case where the spare area is expanded.

FIG. 5A shows a structure initially allocated to a disk, in which the initial OSA0 (initial) is allocated including ATDMA0, but the size of 1/4 of the maximum expandable size that allows the size Y1 of ATDMA0 is allowed by the disk. (max / 4) so that OSA0 (initial) can be extended as needed. In addition, in the present invention, "initial" means before the user first writes to the disk. Therefore, the initial OSA0 allocation may be performed by the disk manufacturer, and may be formatted by the user. It means that it can be initialized by.

Fig. 5B shows a case in which OSA0 (initial) is expanded as necessary during the use of the disk after the initial state. This shows that when OSA0 is expanded, the adjacent user data area is reduced, but the size Y1 of ATDMA0 is not changed. Shows. That is, if the size of OSA0 is extended by the size K2, the current size of the spare area is changed to OSA0 (current) and the size will be "Z2 = Z1 + K2".

Therefore, the size of the current spare area is changed by the additional extension of the spare area, and this is recorded and managed in the TDDS of the management area. This will be described later with reference to FIG. 7.

6A to 6B relate to the method of the second embodiment for managing the spare area of the present invention, and to a case where the spare area is reduced.

FIG. 6A shows a structure initially allocated to a disk, in which the initial OSA0 (initial) is allocated including ATDMA0, and the size Y1 of ATDMA0 is one-fourth the size of the initially allocated OSA0 size X1. It is assigned to (X1 / 4) so that OSA0 (initial) can be reduced as needed.

Fig. 6B shows a case in which OSA0 (initial) is reduced as necessary during the disk use after the initial state. This shows that when OSA0 is reduced, the adjacent user data area is expanded, but the size Y1 of ATDMA0 is not changed. Shows. That is, when the size of OSA0 is reduced by the size K1, the current size of the spare area is changed to OSA0 (current) and the size is "X1-K1".

Therefore, the size of the current spare area is changed by the additional reduction of the spare area, and this is recorded and managed in the TDDS of the management area. This will be described in detail with reference to FIG. 7.

Fig. 7 shows a method of recording the size information of the spare area which is extended / reduced in the temporary defect management area (especially TDDS) of the write once optical disc to which the present invention is applied.

As can be seen from Figs. 5A to 6B, the spare area is operated to be variably expanded or reduced as necessary, but only when the size of the variable spare area can be accurately known, the recording / reproducing apparatus (Fig. 11) is smooth. Defect management and record play will be possible. That is, the spare area is expanded, and user data information should not be recorded in the area newly included as the spare area, and the spare area should not be recorded in the area included as the user data area so that the replacement record for defect management cannot be changed. The size of the area must be recorded in the management area in the disc so that it can be accurately confirmed in any recording / playback apparatus (Fig. 11) in which the disc is loaded.

Fig. 7 briefly shows the structure of the TDDS in which the management information of the present invention is recorded, which has been described above in Fig. 4 as the management information recorded in every update in TDMA (PTDMA or ATDMA).

In general, the TDDS is recorded in one sector (2048 bytes) in size. In the present embodiment, the size information of the spare area is recorded in the a to e th byte positions in one sector, and each of four bytes is allocated for recording. It was made. The a-e th byte positions in the TDDS are intended to represent arbitrary positions in the TDDS, and it will be apparent that the specific byte positions will be used in actual application.

First, the initial allocated spare area size is recorded in the a, b, and c byte positions in the TDDS. The initial size of ISA0 is recorded in the a byte position, and the initial size of OSA0 in the b byte position. And record the initial size of ISA1 at c position. In particular, in case of dual layer, OSA0 = OSA1 has the same size, so any one of them can be recorded. ISA1 does not exist in the case of single layer, so it will be set to “0”, but in case of dual layer, it is recorded as the initial size. Will be.

Next, the size of the spare spare area is recorded in the d and e-th bytes of the TDDS. In the d-th byte, the size of the OSA0 variable is changed in the case of the single layer, and the ISA1 is changed in the dual layer in the e-th byte. The size of the was recorded. Thus, if the optical disc is a single layer, the e-th byte will always be set to "0", only the d-th byte will be written each time the spare area is changed, and if the optical disc is a dual layer, the d-th byte will always be "0". Is set, and only the e-th byte will be written each time the spare area is changed.

By recording the size of the current spare area (OSA0 or ISA1), which is variable as shown in Fig. 7, in TDDS, which is one of the disc management areas, the recording / playback apparatus (Fig. 11) stores the current size information of the recorded spare area. It can be read and utilized effectively for recording reproduction and defect management.

FIG. 8 relates to a third embodiment method for managing a spare area of the present invention. In the case of expanding a spare area, a method of expanding the spare area by a predetermined expansion unit for each expansion is provided.

In FIG. 8, OSA0 (initial) including ATDMA0 is initially assigned, but the size P1 of ATDMA0 is allocated to 1/4 of the total size N1 of OSA0.

After the initial state as described above, i.e., when the spare area needs to be expanded while the disc is in use, the spare area OSA0 can be additionally assigned by the control unit (Figs. 11 and 20) or user command in the recording / playback apparatus.

 That is, at the first extended allocation, OSA0 (1st extpand) has a size of N2, and within the extended OSA0 (1st extpand), a new ATDMA1 having a size of 1/4 of N2 is allocated as well as the initial allocation. Similarly, in the second expansion allocation, OSA0 (2nd expand) is expanded to the size of N3, ATDMA2 included in the expanded OSA0 (2nd extpand) has the size of P3, and P3 is the size of 1/4 of N2.

In the above allocation method, the size of the first extension allocated OSA0 (1st extention) (N2) and the second extension assigned OSA0 (2nd extention) (N3) are different from each other within the maximum expandable size. It may be freely assigned, but preferably it is advantageous to allocate the same predetermined size (N2 = N3) to the stability of the whole system. In addition, if the maximum expandable is determined and the expand unit at one expansion is determined, it is determined that the number of expansions is determined, for example, the initial OSA0 in a single layer structure. If both the initial size and the expanding unit (OSA0) are 1 GB, and the maximum expandable is 9 GB, the number of expansions will be 8 times.

Fig. 9 shows a method of recording size information of a spare area which is extended by a predetermined extension size in a temporary defect management area of a writeable optical disc to which the present invention is applied.

As can be seen from FIG. 8, since the spare area is operated to be extended by a predetermined expansion size as necessary, it is necessary to accurately know the size of the expanded spare area so that a smooth defect can be obtained in the recording / reproducing apparatus (Fig. 11). Management and record playback will be possible. That is, since the spare area is expanded and user data information should not be recorded in the area newly included as the spare area, the size of the extended spare area must be recorded in the management area of the disc so that any recording / playback apparatus loaded with the corresponding disc (Fig. In 11) you will be able to confirm this correctly.

Fig. 9 briefly shows the structure of the TDDS in which the management information of the present invention is recorded, which has been described above with reference to Figs. 4 and 7 as the management information recorded in every update in TDMA (PTDMA or ATDMA).

In general, the TDDS is recorded in one sector (2048 bytes) in size. In the present embodiment, the size information of the initial spare area is recorded by four bytes in the a to c th byte positions in one sector, and the number of times extended. Is written to the f-th byte position as one byte.

First, the size of the initially allocated spare area is recorded in the a, b, and c bytes of the TDDS. The initial size of ISA0 is recorded in the a byte position, and the initial size of OSA0 in the b byte position. The initial size of ISA1 is recorded in the c-th byte position. In particular, in case of dual layer, OSA0 = OSA1 has the same size, so any one of them can be recorded. ISA1 does not exist in the case of single layer, so it will be set to “0”, but in case of dual layer, it is recorded as the initial size. Will be.

Next, the number of expand units (Number of Expand Unit) is recorded in the f-th byte position in the TDDS. In this embodiment, since the expansion size is already predetermined and standardized, the size of the extended spare area is determined by the expansion count alone. It can be inferred. For example, in a single layer structure, if the number of expansions is written twice in the f-th byte and is extended by 1 GB for each expansion, the extended spare area will be 2 GB, and OSA0 written in the b-th byte position If you add an (initial) value, you can see the size of the entire OSA0.

Also, if the maximum number of expansions is limited as a standardized decision, the recording / playback apparatus (Fig. 11) confirms the expansion number information up to the present from the management area of the loaded disc, and the additional expansion number can be inferred. It will also work.

Fig. 10 shows a method of recording the spare area size information and the extension count information together in the temporary defect management area of the write once optical disc to which the present invention is applied.

Although the above-described FIG. 9 is applicable in the case of expanding the same by a predetermined expansion size, it is also possible to limit the number of expansions while varying the expansion size every expansion. In this case, the size of the current extended spare area is Since only the number of expansions is not identified, separate spare area size information should be recorded as shown in FIG. 7, and since the number of expansions is limited, it is necessary to record information on the number of times of extension. FIG. 10 shows a method of recording the size information and the extension count information of the spare area together in the TDDS in preparation for the above case.

First, the size of the initially allocated spare area is recorded in the a, b, and c bytes of the TDDS. The initial size of ISA0 is recorded in the a byte position, and the initial size of OSA0 in the b byte position. The initial size of ISA1 is recorded in the c-th byte position. In particular, in case of dual layer, OSA0 = OSA1 has the same size, so any one of them can be recorded. ISA1 does not exist in the case of single layer, so it will be set to “0”, but in case of dual layer, it is recorded as the initial size. Will be.

Next, the size of the extended spare area is recorded in the d and e-th byte positions in the TDDS. In the d-th byte position, the size of the extended OSA0 is recorded in the single byte layer, and the dual-layer in the e-th byte position. Record the size of the expanded ISA1. Therefore, if the optical disc is a single layer, the e-th byte position will always be set to "0", only the d-th byte position will be recorded each time the spare area is expanded, and if the optical disc is a dual layer, the d-th byte position will always be Set to "0", only the e-th byte position will be written each time the spare area is expanded.

Finally, the extension count information is recorded at the f-th byte position in the TDDS. If the maximum extension count is limited as a standardized item, the recording / playback apparatus (Fig. 11) is used to manage the loaded disc (e.g., TDDS). Information on the number of times of extension can be confirmed, and it is possible to determine an additional number of times of expansion.

10, the expansion size for each expansion of the spare area is not determined, so that the recording / playback apparatus (Fig. 11) expands by determining the size every expansion. The spare area is recorded in the e-th (single-layer) or d-th (dual-layer) byte position, and the extended number so far is recorded in the f-th byte position. By referring to the management information, it becomes very efficient in managing the spare area and performing recording and reproduction.

As described above, the embodiments of the present invention have been described with the example of a write once Blu-ray disc (BD-WO), but the technical concept of the present invention is equally applicable to a rewritable Blu-ray disc (BD-RE). When applied to BD-RE, it is not necessary to allocate separate temporary defect management areas (PTDMA, ATDMA) in the lead-in area and the spare area, and when the spare area is expanded (or reduced), Size information "and" spare area extension number information "may be recorded in the defect management area (DMA).

Fig. 11 relates to a recording and reproducing apparatus for recording and reproducing an optical disc to which the present invention is applied. The recording and reproducing apparatus is composed of a recording and reproducing section 10 for recording and reproducing on an optical disc and a control unit 20 for controlling the recording and reproducing apparatus. The control unit 20 issues a recording or reproducing command to the recording / reproducing section 10 to the specific area, and the recording / reproducing section 10 performs recording / reproducing to the specific area according to the command of the control section 20. FIG. Specifically, the recording and playback section 10 includes an interface section 12 for communicating with the outside, a pickup section 11 for directly recording or reproducing data on an optical disc, and a playback signal received from the pickup section. A data-processor 13 for restoring a signal value or modulating a signal to be recorded into a signal recorded on an optical disk, and transferring the data-processor 13 to pick up a signal accurately from the optical disk or to accurately record a signal on the optical disk. Servo unit 14 for controlling unit 11, memory 15 for temporarily storing various information and data including management information, and microcomputer 16 for controlling the components in the recording / reproducing unit 10. It can consist of.

The method of managing the spare area of the present invention in the optical recording and reproducing apparatus as described above is as follows.

When the optical disc is loaded, the recording and reproducing unit 10 checks the disc structure from the management information recorded in the management area in the loaded optical disc, and in particular, checks the current size information and the extension count information of the spare area, and then controls the control unit 20. The controller 20 determines in advance whether the spare area can be further expanded (or reduced) based on the information notified from the recording / playback unit 10.

 If it is determined that the spare area needs to be changed while the disc is in use, the control unit 20 transfers the size to be changed to the recording / playback unit 10 as an expansion (or reduction) command. In other words, the execution of the expansion (or reduction) command will be a method of recording the size and position information of each area changed by the expansion (or reduction) of the spare area on the disc as management information.

That is, when the spare area is changed (expanded or reduced) as shown in Figs. 5B and 6B, the change of the spare area is completed by recording the size of the changed spare area in a specific management area on the disk.

In the case where the spare area is expanded as shown in FIG. 8, only the extension count information can be recorded as shown in FIG. 9 if the extended extension size is the same every expansion. Not only the information but also the size of the current spare area changed by the expansion is recorded in a specific management area on the disk, so that the additional expansion is completed.

As mentioned above, preferred embodiments of the present invention are disclosed for the purpose of illustration, and those skilled in the art can improve and change various other embodiments within the spirit and technical scope of the present invention disclosed in the appended claims below. , Replacement or addition would be possible.

The present invention proposes a variety of methods for using a spare area variably as needed in a recordable optical disc, thereby enabling a unified standard for the structure of a spare area applicable to a recordable optical disc, thereby enabling a recordable optical disc. There is an advantage to increase the efficiency of use.

Fig. 1 schematically shows the structure of a conventional rewritable optical disc,

Fig. 2 shows a single layer structure of the write once optical disc of the present invention;

Fig. 3 shows a dual layer structure of the write once optical disc of the present invention;

4 shows a method of recording management information in the management area of the present invention;

5A to 5B illustrate a method of expanding a spare area as a first embodiment of managing the spare area of the present invention.

6A to 6B illustrate a method of reducing a spare area as a second embodiment of managing the spare area of the present invention.

Fig. 7 shows one method for recording management information for managing a spare area in the management area according to the present invention,

8 illustrates a method of expanding a spare area to a specific extension size as a third embodiment of managing the spare area of the present invention;

9 shows another method of recording management information for managing a spare area in the management area according to the present invention;

Fig. 10 shows another method of recording management information for managing a spare area in the management area according to the present invention;

Fig. 11 shows a recording / playback apparatus of a recordable optical disc of the present invention.

-Description of the main parts in the drawing-

10: recording and playback section 20: control section

16: micom 15: memory

Claims (18)

In a recordable optical disc having at least one spare area and a management area, Set a new spare area by varying the size of the spare area while the disc is in use, And a current size information of the spare area changed by the change of the spare area is recorded in the management area. The method of claim 1, And recording the size information of the initially allocated spare area in the management area. The method of claim 1, And a spare area existing at the end of the user data area among the spare areas is changeable. The method of claim 3, wherein And wherein the variable spare area is an outer spare area (OSA) located at an outer circumference when the optical disc has one recording layer. The method of claim 3, wherein And the optical disk has two recording layers, wherein the variable spare area is an inner spare area (ISA1) at the end of the user data area. The method of claim 1, The spare area management method of a recordable optical disc, characterized in that the change of the spare area size is possible only for expansion. The method of claim 6, And the spare area size is expanded to a different size at each expansion. The method of claim 7, wherein And the expansion of the spare area size is determined by a maximum number of times of expansion of the spare area. The method of claim 8, And recording information on an extension frequency of the spare area in the management area. In a recordable optical disc having at least one spare area and a management area, While the disk is in use, the size of the spare area can be expanded, and each expansion is made by a predetermined expansion unit, And recording the extended frequency information of the spare area into a management area. The method of claim 10, And recording the size information of the initially allocated spare area in the management area. The method of claim 11, And a size of the current spare area can be checked from the size information of the initially allocated spare area and the expansion frequency information. At least one spare area, And a management area for varying the size of the spare area to set a new spare area while the disc is in use, and for recording current size information of the spare area changed by the change of the spare area. At least one spare area, And a management area capable of expanding the size of the spare area during use of the disk, wherein the spare area extends by a predetermined expansion unit for each expansion, and records information on the number of times of expansion of the spare area. The method according to claim 13 or 14, And the optical disc is a write once Blu-ray disc (BD-WO). The method according to claim 13 or 14,       And the optical disc is a rewritable Blu-ray Disc (BD-RE). A control unit for determining whether the spare area size is variable;       And a recording / reproducing unit for setting a new spare area by varying the size of the spare area according to the determination, and recording current size information of the changed spare area into a management area of the disc. . A controller for determining whether the spare area is additionally expanded; And an recording / reproducing unit for expanding the spare area as necessary to expand the spare area according to the judgment, and for recording the extension number information in the management area of the disc.