KR20040098355A - Method for managing a defect area on optical disc write once - Google Patents

Abstract

PURPOSE: A method for managing defects of a one-time recordable optical disc is provided to stably manage defects by efficiently using a temporary defect list and temporary disc definition structure in a temporary defect management area even if the one-time recordable optical disc has a plurality of recording layers. CONSTITUTION: A one-time recordable optical disc with a plurality of recording layers has a temporary defect management area on which a temporary defect list and temporary disc definition structure are recorded. It is confirmed whether defect areas are generated. The temporary defect list is made out by recording the defect areas in order of generation. The temporary disc definition structure is made out by assigning one cluster to every recording layer.

Description

Method for managing a defect area on optical disc write once}

The present invention relates to a defect area and a method of managing information of an optical disc of write once type.

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.

Blu-ray Disc, one of the world's standard HD-DVDs, uses a 405nm blue-violet laser, which is much denser than current DVDs that use 650nm red lasers, and has a thickness of 1.2mm and a diameter of 12cm with a 0.1mm light transmission layer. You can store more data on your disc than your current DVD.

Blu-ray discs also have a single-layered double layer that has two recording layers on one side of the disc, with a lens numerical aperture (NA) of 0.85, which has a significant effect on the data storage density due to the laser beam passing through the lens. With recording technology, you can store much more data than current DVDs.

Blu-ray discs are very dense, with a high aperture ratio of 0.32μm, less than half the pitch of a DVD. Also, if you make an optical drive using this technology, you can transfer data much faster than DVD-ROM or CD-ROM drives. In the case of video and audio data formats, MPEG-2 (video), AC3, MPEG1, and Layer 2 (audio), which are currently adopted by DVDs, can be used as they are. In addition, if you create an HD-DVD drive that can effectively protect your data, you can store and play it on most DVD discs in use today.

Various standard proposals related to Blu-ray Discs have been prepared, and various standard proposals for a write once Blu-ray Disc (BD-WO) have been prepared following the rewritable Blu-ray Disc (BD-RE).

Fig. 1 schematically shows the recording area structure of a rewritable Blu-ray Disc. The Blu-ray disc of Fig. 1 shows the structure of a recording area for a disc having a single recording layer, and from the inner circumference of the disc, the lead-in zone, data zone, and lead are shown. It is divided into lead-out zones. 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 the data area, respectively.

If a defective area exists in the data area while data is being recorded on the rewritable Blu-ray Disc, the data recorded in the defective area is moved to the spare area to perform alternative recording. As the management information on the defect area, information such as a location related to the defect area, an alternate recorded area, etc. is recorded in the defect management areas DMA1, 2, 3, and 4 provided in the lead-in / out area to perform defect management. do.

Defect management is one of the important issues when recording data on Blu-ray Discs that can be written once.How fast and accurate can you manage defects on Blu-ray Discs that can be written once? Various research and proposal activities have been conducted to solve the problem of whether information can be recorded and obtained.

In order to perform defect area management on a write once Blu-ray disc, a replacement recording area and a management area of defect management information are required. In particular, in a rewritable Blu-ray disc, the size of the defect management area can be reduced because data can be rewritten. However, since a write-only Blu-ray disc can be written only once, the area necessary for managing the defective area is the former. More is needed and sufficient defect management area must be secured for this.

In addition, the provisions of the defect management method in the write-once Blu-ray disc ensure the commonality, consistency and compatibility of the standard with the rewritable Blu-ray disc, as well as more efficient and stable recording and reproducing of information and data. In addition, there is a demand for a protocol for recording and reproducing management information and a method of recording and managing the same to have high performance.

In addition, even in the case of the Blu-ray disc as described above, it is required that the defect management method applicable to the write-once high density optical disc is required.

Accordingly, the present invention has been made in view of the above circumstances, and is intended to provide a defect management method for an optical disc that can be recorded once, and in particular, the defect management area and information for an optical disc having a plurality of recording layers efficiently. Its purpose is to provide a way to manage.

1 schematically shows a general rewritable optical disc structure,

2 is a schematic diagram of a write-once optical disc structure having one recording layer related to the present invention;

3 is a schematic diagram of a write-once optical disc structure having a plurality of recording layers according to the present invention,

Fig. 4 is a schematic diagram of another write once optical structure with a plurality of recording layers according to the present invention;

5 and 6 illustrate a first embodiment of a defect management method for a write once optical disc according to the present invention;

7 and 8 illustrate a second embodiment of a defect management method for a write once optical disc according to the present invention.

According to the present invention, a defect management method for a write once optical disc according to the present invention includes a temporary defect management area, and records temporary defect area information and temporary defect management information in a temporary defect management area. In a write once optical disc having a plurality of recording layers for managing a defective area, the temporary defect area information is recorded and managed in the order of occurrence of the defective area, and the temporary defect management information is separately recorded for each recording layer of a plurality of layers. Characterized in that,

In addition, the method of managing a defect of an optical disc of write once type according to the present invention comprises a plurality of defect management areas for providing a temporary defect management area and recording temporary defect area information and temporary defect management information in the temporary defect management area. In the write-once optical disc having a recording layer of the recording medium, the temporary defect area information and the temporary defect management information are classified into recording layers of a plurality of layers, and the information on the recording layer is recorded and managed.

In addition, the optical disc which can be written once according to the present invention includes a temporary defect management area in a specific area of a disk having a plurality of recording layers, and records temporary defect area information and temporary defect management information in the temporary defect management area. And an area for the temporary defect management information is recorded and managed separately for each of the plurality of recording layers.

Hereinafter, a preferred embodiment of a defect management method for a write once optical disc according to the present invention will be described in detail with reference to the accompanying drawings.

2, 3, and 4 are schematic embodiments of a disc structure of a writeable optical disc to which the present invention can be applied, and FIG. 2 relates to a single layer disc (hereinafter, referred to as 'SL'). 3 and 4 are related to dual layer (DL) disks.

First, it can be seen that a temporary defect management area (hereinafter referred to as 'TDMA') is required for defect management on a write once optical disc. That is, in the case of a rewritable optical disc as shown in FIG. 1, even if only a limited size of a defect management area (hereinafter referred to as 'DMA') is required, a large amount of DMA is required because writing and erasing can be repeated in this area. However, in the case of an optical disc that can be written once, a once-recorded area cannot be used for recording again, so a larger management area is required for defect management, which is named TDMA separately from DMA. 2, 3, and 4 show the case of a Blu-ray disc as an example. In this case, the minimum recordable unit for recording will be a cluster.

3 illustrates a case of a DL disc to which the present invention can be applied, wherein TDMA is provided in the lead-in / out area and the outer spare areas OSA0 and OSA1 for each layer (Layer 0, 1). At this time, TDMA1,2 was placed in the lead-in / out area and TDMA3,4 was provided in the outer spare area in consideration of the order of use. The order of use of TDMA has little to do with the gist of the present invention, and the order of use may be determined in other ways. In addition, TDMA 1 and 2 are areas having a fixed size, and TDMA 3 and 4 have the same size, respectively, and can be arbitrarily selected by the user (P clusters) or assigned to sizes that are linked to the sizes of the spare areas OSA0 and OSA1. (E.g. P = (N * 256) / 4 in FIG. 3).

4 illustrates another case of a DL disc to which the present invention can be applied, in which TDMA has a lead-in / out area and a spare area OSA0, OSA1, and ISA1 having variable sizes for each layer (Layer 0, 1). If it is equipped with. At this time, TDMA1 and 2 are allocated to the lead-in / out area, TDMA3 and 4 are allocated to the outer spare areas OSA0 and OSA1, and TDMA5 is allocated to the spare area ISA1, which is the end of the data area. One case. The order of use of TDMA has little to do with the gist of the present invention, and the order of use may be determined in other ways. In addition, TDMA 1, 2 is a region having a fixed size, and the size of TDMA 3, 4, 5 is arbitrarily selectable by the user (P, Q clusters) or assigned to a size that is linked to the size of the spare regions (OSA0, OSA1). (E.g., P = (N * 256) / 4, Q = (L * 256) / 4, in Figure 4).

5, 6, 7, and 8 show two embodiments of a method of recording management information in TDMA to which the present invention is applied.

First, the definition of terms used in the present invention will be clarified.

First of all, temporary defect area information (hereinafter referred to as 'TDFL') refers to information that manages a series of processes as a defective area list when a defective area is generated in the data area. do. That is, such information is represented as an entry, which represents information about one defective area (having defect position information and replacement position information) as one entry. Therefore, if a defective area is generated and replaced, the TDFL of the present invention will be created by adding a new entry.

Next, there is temporary defect management information (hereinafter referred to as 'TDDS') including overall defect management information of the disc including the TDFL location information. That is, the TDDS includes various information required by the disk in addition to the information required by the present invention. More specifically, the first sector (sector0) of one cluster (32 sectors) includes defect management information. Disk management information is included, and the remaining sectors (sector 1 to sector 31) have information indicating the disk usage status.

A detailed recording method and a usage method of the TDFL and the TDDS recorded and managed in the TDMA will be described in detail with reference to FIGS. 5, 6, 7, and 8.

Example 1

5 and 6 show a first embodiment of a recording method in the TDMA of the present invention. As a feature of the present invention, TDFLs are created without distinguishing a plurality of recording layers, but TDDSs are prepared separately for each recording layer. Is in.

In FIG. 5, the hatched area indicates the size of the defect area entry used. Usually, such an entry is expressed as 8 bytes, so that about 8000 entries can be recorded in one cluster compared to one cluster. .

If a defective area occurs while the disc is in use, a defective area entry is created in the TDFL followed by a TDDS. At this time, the TDFL is created by sorting in the order in which the defective areas are generated regardless of the recording layer where the defective areas are generated. Subsequently, a TDDS is created. The TDDS is sequentially created by dividing each recording layer and allocating one cluster for each recording layer. For example, in the case of a DL disc having two recording layers, TDDS is a method in which two clusters are always recorded and managed by one cluster for each layer (TDDS for L0 and TDDS for L1).

TDFL is also used as a cumulative concept. In other words, when the second TDFL is recorded, a new entry is added together with the previously recorded TDFL. This ensures that only the latest TDFL is checked, so that the entries contained in the entire TDFL can be identified. Therefore, when an entry is used cumulatively and cannot be included in one cluster, the TDFL is recorded using two clusters. Thus, a variable TDFL (Variable TDFL) recording method in which the size of the TDFL can be changed is called. In the case of a Blu-ray disc, the TDFL may be recorded up to 4 clusters in consideration of the total disc size.

Figure 6 shows the details contained in the TDDS in the first embodiment of the present invention. The TDDS shown in Fig. 6 is a method applicable to both TDDS (TDDS for LO and TDDS for L1) for each recording layer. In the first sector of the TDDS (sector0, one sector has a size of about 2048 bytes), the defect management information and the disk management information are recorded. In the present invention, the latest PSD of TDFL area information is used. It should be recorded additionally. That is, the latest position information of the TDFL recorded cumulatively is recorded in each TDDS, so that the latest position information of the TDFL can be easily found by checking the above information in the TDDS.

In addition, the TDDS of the present invention has information indicative of the use state of each recording layer in the remaining sectors sector1 to sector31. Due to the use state information for each recording layer, the TDDS is generated for each recording layer. Here, the use state information may be variously expressed as information for confirming the current recording state of each recording layer, but in the present invention, track information (Track-Info) and recording completion indication information (Space-Bit-Map, or SBM) Suggest.

The track information is divided into a plurality of tracks, and each track is divided into open tracks that can be additionally recorded and complete tracks that cannot be additionally recorded (complete-track or close-track). This is a way to check the status of use.

The recording completion indication information (SBM) is a method in which the usage status of the entire recording layer can be checked by mapping bits one to one indicating whether recording is performed for each cluster, which is the minimum recording unit of each recording layer.

Therefore, by checking the track information or the recording completion indication information (SBM) which are updated together every time the TDDS is updated, it is possible to confirm the correct use status of each recording layer.

The first embodiment of the present invention is characterized in that TDDS divided by recording layer is always recorded together by tying it into one unit. That is, since TDFL is freely used for each recording layer, TDDS (TDDS for L0, TDDS for L1) for each recording layer should be recorded together as if it is one unit. For example, in the case of a DL disc having two recording layers, the TDDS recorded after the TDFL will have two clusters recorded in one unit, one cluster for each recording layer.

Example 2

7 and 8 show a second embodiment of a recording method in the TDMA of the present invention, which is characterized in that both the TDFL and the TDDS are prepared for each recording layer.

In FIG. 7, the hatched portion indicates the size of the defective area entry. In general, such an entry is represented by 8 bytes, and as compared to 1 cluster, about 8000 entries can be recorded in one cluster. .

If a defective area occurs while the disc is in use, a defective area entry is created in the TDFL followed by a TDDS. In this case, the TDFL is interlocked with the recording layer in which the defective area is generated and is prepared separately for each recording layer in which the defective area is generated (TDFL for L0, or TDFL for L1). Subsequently, a TDDS is created. The TDDS also divides each recording layer and allocates one cluster to the recording layer where the TDFL is generated.

TDFL is also used as a cumulative concept. In other words, when the second TDFL is recorded, a new entry is added together with the previously recorded TDFL. This ensures that only the latest TDFL is checked, so that the entries contained in the entire TDFL can be identified. Therefore, when an entry is used cumulatively and cannot be included in one cluster, the TDFL is recorded using two clusters. Thus, a variable TDFL (Variable TDFL) recording method in which the size of the TDFL can be changed is called. In the case of a Blu-ray disc, the TDFL may be recorded up to 4 clusters in consideration of the total disc size.

8 illustrates specific contents included in the TDDS in the second embodiment of the present invention. The TDDS shown in FIG. 8 is a method applicable to both TDDS (TDDS for LO and TDDS for L1) for each recording layer. In the first sector of the TDDS (sector0, one sector has a size of about 2048 bytes), the defect management information and the disk management information are recorded. In the present invention, the latest TDFL position information for each recording layer (The first PSN of latest TDFL (L0) Area and The first PSN of latest TDFL (L1) Area) should be additionally recorded. That is, the latest position information of the TDFL in each recording layer recorded cumulatively is recorded in each TDDS, so that the latest position information of the TDFL can be easily found by checking the above information in the TDDS. For example, in the use state as shown in Fig. 7, first, a TDFL (TDFL for L0) for the first recording layer is recorded, and then a TDDS (TDDS for L0) for the first recording layer is recorded in this case in the TDDS (L0). The latest TDFL information included is the latest TDFL location information for the first recording layer only (The first PSN of latest TDFL (L0) Area) will have a specific value and the latest TDFL for the second recording layer that has not been recorded yet. The location information (The first PSN of latest TDFL (L1) Area) may be set to a zero value. Of course, in this case, as another embodiment, the TDDS of the recording layer may be defined as having only the TDFL information of the recording layer.

In addition, the TDDS of each recording layer has the latest TDDS location information (The first PSN of latest TDDS (L0) Area and The first PSN of latest TDDS (L1) Area) of each recording layer. Reading the information in the last TDDS (regardless of the recording layer) in the TDMA from the above information makes it possible to identify the latest TDFL and TDDS for each recording layer.

In addition, the TDDS according to the second embodiment of the present invention has information indicating the use state of each recording layer in the remaining sectors sector1 to sector31. Here, the use state information may be variously expressed as information for confirming the current recording state of each recording layer, but in the present invention, track information (Track-Info) and recording completion indication information (Space-Bit-Map, or SBM) Suggest.

Track information is divided into a plurality of tracks, and each track is divided into open tracks that can be additionally recorded and complete tracks that cannot be additionally recorded (complete-track or close-track). This is a way to check the usage of the floor.

The recording completion indication information (SBM) is a method in which the usage status of the entire recording layer can be checked by mapping bits one to one indicating whether recording is performed for each cluster, which is the minimum recording unit of each recording layer.

Therefore, by checking the track information or the recording completion indication information (SBM) which are updated together every time the TDDS is updated, it is possible to confirm the correct use status of each recording layer.

That is, according to the second embodiment of the present invention, unlike the first embodiment, the TDFL is divided and used for each recording layer. Accordingly, only one TDDS is created for each recording layer. Therefore, in comparison with the first embodiment, the use of the first embodiment is simple and convenient. However, since TDDS is always recorded in one unit of 2 clusters, more TDMA usage capacity is required than in the second embodiment. The TDMA usage capacity is reduced than in the first embodiment, but there is a difference in that more items are managed than in the first embodiment.

Therefore, the first embodiment or the second embodiment has a complementary aspect, and a system or a user may select and use an optimal method for their environment.

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 defect management method for a write once optical disc according to the present invention as described above is particularly suitable for temporary defect area information (TDFL) and temporary defect management in a temporary defect management area (TDMA) even in the case of an optical disc having a plurality of recording layers. By providing a method of efficiently using information (TDDS), it is a very useful invention that enables defect management of an optical disk capable of stably recording once.

Claims (19)

In a temporary recordable optical disc having a temporary defect management area, and having a plurality of recording layers for recording the temporary defect area information and the temporary defect management information in the temporary defect management area to manage the defect area of the disc, The temporary defect area information is recorded and managed in the order of occurrence of the defect area, And wherein the temporary defect management information comprises recording and managing each of the recording layers of a plurality of layers. 2. The method of claim 1, wherein the temporary defect management information records and manages all of the plurality of recording layers in one unit. The defect management method according to claim 1 or 2, wherein the plurality of recording layers are composed of two layers. 4. The method of claim 3, wherein the temporary defect management information is created by one cluster for each recording layer and simultaneously recording two clusters at each recording time. 2. The method of claim 1, wherein the temporary defect management information is recorded and managed including position information indicating a position of the latest temporary defect area information. The defect management method according to claim 1, wherein the temporary defect management information is recorded and managed including the use status information of the corresponding recording layer. 7. The method of claim 6, wherein the use state information is track information of a corresponding recording layer. 7. The method of claim 6, wherein the use state information is recording completion indication information for each recording unit of the recording layer. 2. The method of claim 1, wherein the temporary defect area information is recorded and managed cumulatively including previously recorded temporary defect area information. In a temporary recordable optical disc having a temporary defect management area, and having a plurality of recording layers for recording the temporary defect area information and the temporary defect management information in the temporary defect management area to manage the defect area of the disc, Checking whether a defective area is generated; And the temporary defect area information is recorded in the order of occurrence of the defective area, and the temporary defect management information is recorded for each recording layer separately for each of the plurality of recording layers. A defect management method for a write once optical disc. In a one-time recordable optical disc having a temporary defect management area and having a plurality of recording layers for recording the temporary defect area information and the temporary defect management information in the temporary defect management area to manage the defect area of the disc, Wherein the temporary defect area information and the temporary defect management information are classified for each recording layer in a plurality of layers, and records and manages information on the corresponding recording layer. 12. The method of claim 11, wherein the temporary defect management information is recorded and managed including position information indicating a position of the latest temporary defect area information of a corresponding recording layer. 12. The method of claim 11, wherein the temporary defect management information is recorded and managed including information on the use state of the corresponding recording layer. 15. The method of claim 13, wherein the use state information is track information of a corresponding recording layer. 15. The method of claim 13, wherein the use state information is recording completion indication information for each recording unit of the recording layer. 12. The optical disc of claim 11, wherein the temporary defect management information classified for each recording layer includes recording location information indicating the latest position of the temporary defect management information for the other recording layer. Defect management methods. 12. The method of claim 11, wherein the temporary defect area information is recorded and managed cumulatively including previously recorded temporary defect area information. In a one-time recordable optical disc having a temporary defect management area and having a plurality of recording layers for recording the temporary defect area information and the temporary defect management information in the temporary defect management area to manage the defect area of the disc, Checking whether a defective area is generated and the recording layer has occurred; And recording the temporary defect area information and the temporary defect management information separately for each corresponding recording layer according to the result of the checking. A temporary defect management area is provided in a specific area of a disc having a plurality of recording layers, and an area for recording temporary defect area information and temporary defect management information is provided in the temporary defect management area. An optical disc of write once type, characterized in that the recording management is performed separately for each recording layer of a plurality of layers.