KR20040094963A - Defect management for optical disc writable once - Google Patents

Abstract

PURPOSE: A defect management method of a write-once optical recording medium is provided to replace a defect area, and to record defect management information by using plural TDMAs(Temporary Defect Management Areas) to use the TDMAs, thereby obtaining sufficient TDMAs. CONSTITUTION: Management information is recorded in the first TDMA having a fixed size. When the recording in the first TDMA is completed, management information is recorded in the second TDMA assigned in a specific zone within a spare zone. The first TDMA is assigned to a lead-in zone. The second TDMA is assigned every spare zone which is variably assigned. The second TDMA is used in opposite direction to the spare zone for replacing a defect area.

Description

Recordable optical record carrier and its defect management method {DEFECT MANAGEMENT FOR OPTICAL DISC WRITABLE ONCE}

The present invention relates to a method of managing a defect area of an optical record carrier that can be recorded once, and in particular, a method of allocating a temporary defect management area, a method of using the same, and a temporary defect management area and a spare area allocated to the present invention. An optical record carrier capable of recording once.

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 particular, Blu-ray discs use a 405 nm blue-violet laser, which is much denser than current DVDs using 650 nm red lasers, and are superior to current DVDs on 1.2 mm thick, 12 cm diameter discs with a 0.1 mm recording layer. It can store a large amount of data.

Blu-ray discs also have single-sided multi-layer recording, which has a lens numerical aperture (NA) of 0.85, which has a significant effect on the data storage density due to the detailed laser irradiation through the lens. With technology, you can store much more data than current DVDs.

Recently, various standards related to Blu-ray Disc have been prepared, and various standards for Blu-ray Disc (BD-WO) that can be written once are 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 SL (Single Layer) disc, and from the inner circumference of the disc, a lead-in zone, a data zone, and a lead-in disc are shown. It is divided into a lead-out zone.

In addition, the data area is divided into an area for recording actual user data and a spare area (ISA0 / OSA0) for replacing defective areas.

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 transferred to a spare area prepared in advance, and an alternative recording operation is performed. As management information on the defect area, information such as a position related to the defect area, an alternately recorded area, and the like is recorded in the defect management areas (DMA1, DMA2, DMA3, and DMA4) in a predetermined protocol.

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.

An object of the present invention is to provide a method for allocating and using a defect management area in a method of allocating a temporary defect management area having a fixed size and a temporary defect management area having a variable size in an optical record medium that can be written once. .

It is still another object of the present invention to provide a spare area for replacing a defective area and a temporary defect management area for recording defect management information for managing the defective area in a write-once optical recording medium, and having a fixed size. Recording management information in a temporary defect management area, and recording management information in a second temporary defect management area assigned to a specific area in the spare area when the recording is completed in the first temporary defect management area. To provide.

It is another object of the present invention to provide a write-once optical record carrier, in which a temporary defect management area allocated to a spare area is used in a direction opposite to that for replacement recording. To provide a defect management method.

It is still another object of the present invention to provide a plurality of temporary defect management areas for defect area management, wherein the plurality of temporary defect management areas include a temporary defect management area having a fixed size and a temporary defect management area having a variable size. The temporary defect management area having a variable size is provided to provide a write once optical recording medium characterized by allocating a part of a spare area.

1 is a diagram showing the configuration of a recording area of a general rewritable optical recording medium;

FIG. 2 is a diagram showing the configuration of a recording area of a write once single layer (SL) optical recording medium according to the first embodiment of the present invention; FIG.

FIG. 3 is a diagram showing the configuration of a recording area of a write once type dual layer (DL) optical recording medium according to the first embodiment of the present invention; FIG.

4 is a diagram schematically showing an example of a method of using a temporary defect management area in the present invention;

5 is a diagram showing another example of a method of using a temporary defect management area in the present invention;

6 is a diagram schematically showing temporary defect management information in the present invention.

FIG. 7 is a diagram schematically showing a configuration of a recording area of a write once type single layer (SL) optical recording medium according to the second embodiment of the present invention.

8 is a diagram showing the configuration of a recording area of a write once dual layer (DL) optical recording medium according to a second embodiment of the present invention;

In the embodiments described in the present invention and referred to by the drawings, the numerical values such as the position of each region or the size thereof are merely exemplary for ease of explanation and understanding, and examples of the numerical values within the scope of the technical idea of the present invention. Is not limited.

Example 1-1

FIG. 2 schematically shows a recording area structure of a single-layer writeable single layer (hereinafter referred to as SL) optical recording medium as a first embodiment of the present invention. 2 shows a single layer (SL) disk structure, which is divided into a lead-in zone, a data zone, and a lead-out zone. . Arrows displayed in each area represent an example of the data recording direction.

The lead-in area is provided with a temporary defect management area TDMA1 proposed in the present invention. Here, TDMA1 means a temporary defect management area and is used to distinguish it from existing defect management areas (DMA; DMA1, DMA2, DMA3, and DMA4). The temporary defect management area TDMA1 provided in the lead-in area has a fixed size, for example, 2048 clusters.

The data area includes an inner spare area ISA0 and an outer spare area OSA0. The inner spare area ISA0 is used to replace the defective area. In other words, ISA0 is not allocated an area for temporary defect management. The outer spare area OSA0 is provided with a temporary defect management area TDMA2 proposed in the present invention. The outer spare area OSA0 utilizes a part as the temporary defect management area TDMA2 and a part of the outer spare area OSA0 as a replacement area OSA0_0 of the defect area. In other words, the temporary defect management area (TDMA2) is used from the beginning of the OSA0 area, and the area for linear replacement (hereinafter referred to as L / R) (referred to as the conventional pure spare area) is used in reverse from the end of OSA0. It is done. That is, the regions for TDMA2 and L / R are used to face each other in OSA0. Compared with the recording direction of the user data area, TDMA2 is the same as the recording direction of the user data area, and the area for L / R is reversed.

The practical use will be described. If the defect area (not shown) is found in the user data area, the defective area is recorded into the spare area (ISA0 or OSA0), and the replacement area (L / R) is recorded. Management information is recorded in the temporary defect management area (TDMA1 or TDMA2). The defect management information includes a temporary defect list (TDFL) that informs the location of the defect area and a temporary disc definition structure information (TDDS) that records management information of the entire recording medium including defect management. Structure).

In the present invention, as the information recorded in the TDDS, the first available information of the area for L / R in TDMA2 and ISA0 and OSA0 is additionally recorded. The first usable spare address in ISA0 or OSA0 for the L / R in ISA0 and OSA0 can be easily known, and the first usable information for the TDMA2 region (First usable). From the TDMA address in OSA0, it becomes easy to know the available location for recording the ship management information.

In addition, in the present invention, spare full flag information is recorded and managed in the TDDS, which is information indicating that the spare area (ISA0 or OSA0) has been solved by using L / R or TDMA. In this case, by using TDMA2 and L / R in opposite directions at the same time, the corresponding area can be pooled by any one. When OSA0 is pooled, the area can no longer be used.

As in the first embodiment of the present invention, the temporary defect management area necessary for defect management in the write once optical recording medium can be additionally recorded in the conventional spare area to ensure sufficient temporary defect management area. Of course, there is no problem in compatibility with the existing rewritable optical recording medium.

Example 1-2

FIG. 3 is a schematic diagram showing the structure of a recording area of a dual-layer (hereinafter referred to as DL) optical recording medium which can be written once as a first embodiment of the present invention. The optical recording medium of FIG. 3 shows a DL (Dual Layer) disk structure, which is divided into lead-in zones, data zones, and outer zones in each recording layer. Outer Zone1). Arrows displayed in each area represent an example of the data recording direction.

In the inner area (lead-in area, lead-out area), the temporary defect management areas TDMA 1 and 5 proposed in the present invention are provided in each recording layer. The data area includes an inner spare area (ISA0, ISA1) and an outer spare area (OSA0.OSA1) for each recording layer. In the specific inner spare area ISA1 and the outer spare area OSA0, OSA1, the temporary defect management areas TDMA2, 3, 4 and L / R areas proposed by the present invention can be written in opposite directions, respectively. do. In addition, in the inner spare area ISA0, as in the case of SL, only replacement recording for L / R is possible.

In the case of the DL, as in the case of the SL, the first position information available for each region and the full flag of the spare region are required.

In the method of allocating the temporary defect management area, the method of allocating the spare area, and the method of managing the defect, the allocation of the temporary defect management area is influenced according to whether the spare area is allocated.

In summary, a case where a spare area is not allocated may be considered, which is a case where only the temporary defect management areas TDMA1 and 5 are used as described above, and only an inner spare area ISA0 is allocated. Similarly, only the temporary defect management areas TDMA 1 and 5 are to be utilized. If the inner spare area ISA0 and the outer spare areas OSA0 and OSA1 are allocated, the temporary defect management areas TDMA2 and 3 are allocated, and only the inner spare areas ISA0 and ISA1 are allocated and the outer spare area. If OSA0 and OSA1 are not allocated, the temporary defect management area TDMA4 may be allocated. If all spare areas are allocated, the temporary defect management areas TDMA2, 3, and 4 may be allocated and used as described above.

4 and 5 schematically illustrate a method of using a temporary defect management area, that is, TDMA, in the present invention. The temporary defect management area usage method shown in FIG. 4 means that the order of use for a plurality of temporary defect management areas is determined and used according to the order. Here, TDMA consists of a TDDS describing temporary DDS information and a TDFL describing a list of defective areas as described above, and if TDMA1 is written first and there is no more space to write to TDMA1 (TDMA full), TDMA2 To record the defect management information using TDMA2, or vice versa, to record the defect management information using TDMA2 first, and to record the defect management area using TDMA1 when TDMA2 is full (i.e. OSA0 is full). It is possible. In this case, since information indicating which area is full among a plurality of temporary defect management areas is required, information describing whether the defect management area is full is defined as a temporary defect management area full flag. And it can be used as an example how to include it in the TDDS as shown in FIG.

According to the method of using the defect management area, if a defect area occurs during data recording on a write-once optical disc, data to be recorded in the defect area is replaced with a predetermined replacement area, and the defect management information starts from TDMA1. This method starts and writes in the order of TDMA2.

5 schematically shows another method of using the temporary defect management area in the present invention. The temporary defect management area using method shown in Fig. 5 is a method of randomly using randomly without setting the order of use, and the temporary defect management area pool flag described above can also be applied.

In FIG. 4 and FIG. 5, the temporary defect management area pool flag means that if one defect management area is used up, another defect management area is used. If all the defect management areas reach the full state, further defect management is performed. That means you can't.

According to the method of using the defect management area, if a defect area occurs during data recording on a write-once optical disc, the data to be recorded in the defect area is replaced with a predetermined replacement area, and the defect management information is stored in TDMA1 or the like. This is a method of randomly recording the TDMA2.

As another method of using the temporary defect management area in the present invention, there is a method in which the purpose of use is determined for each of the plurality of defect management areas.

For example, a method of recording defect management information in TDMA2 while the disc is in use and recording latest defect management information in TDMA1 at the time of ejecting the disc can be used. That is, a method of dividing an area for recording defect management information into an area for recording defect management information in use and an area for recording defect management information during ejection is used.

According to the method of using the defect management area, if a defect area occurs during data recording on an optical disc that can be recorded once, the data to be recorded in the defect area is replaced with a predetermined replacement area, and the defect management information is used by the disc. During the recording process, the latest defect management information is recorded in the TDMA1.

In the present invention, another method of setting and using a purpose for each of the plurality of defect management areas may be a method used based on importance. For example, if the update priority is low, the defect management information is recorded in TDMA2. If the update is low, the defect management information is recorded in TDMA1.

Here, the criteria for determining whether or not it is important can be set in various ways. Since the disc ejection is a very important moment in recording the defect management information, this case can be set as an important case. In the end, as described above, it is the same as the method of writing to TDMA2 because it is less important than the eject when using the disk, and writing to TDMA1 when it is important to eject.

Another criterion of importance is the update interval. In other words, if the interval from the previously updated time point to the current update time point is long, the current update information is considered to be relatively important. In this case, a method of recording defect management information in TDMA1 may be used even when the disk is in use. Another criterion of importance is the relatively large defect area. Since a large number of defective areas can be regarded as a case where greater reliability is required for preservation of information, a large number of defective areas is recorded in TDMA1 even when the disk is in use.

Thus, if the defect management information is recorded in the TDMA1 according to the purpose of use, and in particular the importance, the TDMA1 is located in the inner circumference of the disk, thus providing a foundation for quickly and accurately acquiring important information from the beginning when reading the information recorded on the disk. It will be very useful in that regard.

6 schematically shows an example of TDDS in defect management information in the present invention. According to the present invention, as described above, it is possible to record information for recording the first position information usable and information indicating whether the spare area and the temporary box management area are full, in the form of a flag. In this case, if the order of use of the temporary defect management area is 'ordered' as shown in FIG. 4 in advance, the first available location information may be managed by recording only the last available first location information without being present in each area. This is a matter of choice.

Example 2

7 and 8 are related to the second embodiment of the present invention and schematically show the case of SL and DL, respectively. Here, the second embodiment is different from the first embodiment in that the TDMA recorded in the spare areas OSA0, OSA1, and ISA1 is limited to the maximum use of 1/2 of the size in each spare area.

In the case of DL, the TDMAs recorded in each spare area can be used in a specific order as if they were used as one. As can be seen from FIG. 8, in this case, the name is unified to TDMA2, and the order of use is that TDMA2 in OSA0-> OSA1-> ISA1 can be used. In this case, only one first available TDMA2 location information may be sufficient. . Of course, as in the first embodiment, the TDMA2 order may be randomized. In this case, it is preferable that the first available TDMA2 location information exists in each area.

The present invention alternately records a defective area into an alternative area in a recordable optical recording medium, and records defect management information by using a plurality of temporary defect management areas separately provided in a specific area of the disc, and a temporary defect management area. By using a fixed size and being used in a specific direction within the spare area, sufficient temporary defect management area can be secured, so that a recordable optical record medium can also be used to create, record and read defect management information, and use this information. Defect management was facilitated.

Claims (8)

In a write-once optical recording medium having a spare area for replacing a defective area and a temporary defect management area for recording defect management information for defect area management, Recording management information in a first temporary defect management area having a fixed size; And recording the management information in the second temporary defect management area allocated to the specific area in the spare area when the recording is completed in the first temporary defect management area. Way. 2. The method of claim 1, wherein the first temporary defect management area is assigned to a lead-in area. 2. The method of claim 1, wherein the second temporary defect management area is allocated for each spare area that is variably allocated. 2. The method of claim 1, wherein the second temporary defect management area is used in a direction opposite to the spare area for replacing the defective area. 2. The method of claim 1, wherein the second temporary defect management area is allocated to a maximum size of 1/2 of the entire spare area. In a recordable optical recording medium having a spare area for replacing the defective area for managing the defective area, When a defective area is detected, the alternate recording is performed sequentially from a specific area of the spare area. And recording the temporary defect management information of the defective area sequentially in a direction facing the alternate recording direction in the spare area. 7. The method of claim 6, wherein the spare area is assignable to a variable size. The temporary defect management area for recording defect area management information, the first spare area used only for replacing the defective area, and a part for replacing the defective area in a specific area of the optical record medium that can be written once. And the other part includes a second spare area utilized as a defect management area.