CN1870148A - Write once disc, method of managing the data area of write once disc, and apparatus and method for reproducing data from write once disc - Google Patents

Abstract

A write-once disc allowing management of a data area, a method of managing a data area of a write-once disc, an apparatus for recording data on a write-once disc, a Apparatus and method for reproducing data on disc. A write-once disc includes: a lead-in zone, a data area, and a lead-out zone. A write-once disc includes a predetermined area storing area allocation information indicating whether at least one sector of a data area is allocated for disc defect management. In the disc and method, zone allocation information specifying the structure of the data zone is recorded on the disc, thus allowing a recording/reproducing device to recognize the data zone structure. Therefore, an area such as a spare area for disc defect management can be allocated to the data area in addition to the area for storing user data. Allocating areas for disc defect management to data areas ensures efficient use of write-once discs.

Description

Write-once disc, method of managing data area of write-once disc, and apparatus and method for reproducing data thereof

This application is the result of a patent application filed on March 11, 2004, with application number 200480005000.5, entitled "Write-once disk, method for managing data area of write-once disk, and device and method for reproducing its data" Divisional application.

Technical field

The present invention relates to a write-once disc, and more particularly, to a write-once disc that allows allocation of an area for storing data other than user data, a system for managing a data area of a write-once disc A method, an apparatus for recording data in a write-once disc, and a method and apparatus for reproducing data from a write-once disc.

Background technique

Defect management is performed to allow a user to rewrite user data of a portion of the user data area in which a defect occurs to a new portion of the user data area of the disc, thereby compensating for loss in data caused by the defect. Typically, defect management is performed using linear replacement or sliding replacement methods. In the linear replacement method, a user data area in which a defect occurs is replaced by a spare data area without a defect. In the sliding replacement method, a defective user data area is slid over to use the next non-defective user data area.

Both the linear replacement and sliding replacement methods are applicable only to discs such as DVD-RAM/RW on which data can be repeatedly recorded and recording can be performed using a random access method.

Meanwhile, a method of disc defect management using a linear replacement method even on a write-once disc on which rewriting of data is not allowed has also been developed.

However, there are some cases where disc defect management cannot be performed on a write-once disc with a recording/reproducing apparatus using the linear replacement method. For example, when data is recorded on a write-once disc in real time, it is difficult to perform disc defect management thereon with a recording/reproducing apparatus using a linear replacement method.

Therefore, the spare area is allocated to the write-once disc only when it is necessary to use the disc defect management of the recording/reproducing apparatus. That is, the allocation of the spare area is determined by the user's intention.

Furthermore, if necessary, not only the spare area but also other areas may be allocated to the data area of the write-once disc for disc defect management.

However, when other areas than for user data are allocated to the data area, the recording/reproducing device cannot recognize the structure of the data area.

In other words, if the write-once disc does not contain information on the structure of the data area, the recording/reproducing device cannot determine whether other areas for information other than user data are allocated to the data area, nor can it determine when other areas are allocated to the data area. The location and size of the user data area when formed.

After the write operation, information specifying the area containing the data is written in a bit-mapped format to a predetermined area of the disc, thereby enabling further write or read operations.

More specifically, a recordable area of a disc includes a plurality of clusters which are data recording units or error correction units. If clusters containing data and blank clusters are recorded as information in a bitmap format, a recording/reproducing device can easily access a desired area during a write or read operation.

In particular, bitmap information specifying areas containing data is useful when using write-once discs. In other words, it is necessary to quickly detect a cluster next to a cluster in which data was most recently recorded in order to write data to a write-once disc. The bitmap information ensures fast detection of the next cluster.

Furthermore, it is possible to check a change in the recording state of a write-once disc using the bitmap information and detect the original data recorded before the change occurred. The disc recording status can be changed by further recording data to the write-once disc containing the data.

Contents of invention

The present invention provides a write-once disc on which both user data and other data can be recorded and managed in a data area.

The present invention also provides a disc whose data recording state can be easily checked.

The present invention also provides a method of managing a data area of a write-once disc so that both user data and other data can be recorded and managed in the data area.

The present invention also provides a recording device that records and manages both user data and other data in a data area of a write-once disc.

The present invention also provides a method of reproducing data from a write-once disc on which user data and other data are recorded in a data area. The present invention also provides an apparatus for reproducing data from a write-once disc on which user data and other data are recorded in a data area.

According to an aspect of the present invention, there is provided a write-once disc comprising: a lead-in zone, a data area, and a lead-out zone, the disc comprising a predetermined area storing an indication whether at least one sector of the data area is allocated for Area allocation information for disk defect management.

According to another aspect of the present invention, there is provided a write-once disc with at least one recording layer, which includes at least one data area for storing user data, and at least one predetermined area for storing area allocation information, wherein the area allocation The information indicates whether at least one sector of the at least one data zone is allocated for disc defect management.

According to another aspect of the present invention, there is provided a method of managing a data area of a write-once disc, receiving an instruction as to whether at least a portion of the data area of a disc for disc defect management needs to be allocated, and recording area allocation information , which indicates whether, in a predetermined area of the disc, at least one sector of the data area is allocated for disc defect management.

According to another aspect of the present invention, there is provided a recording apparatus including: a recording/reproducing unit which records data on a write-once disc or reads data from a write-once disc; and a controller which controls recording The /reproducing unit records area allocation information indicating whether at least one sector of the data area of the disc is allocated for disc defect management in a predetermined area of the disc in response to the instruction on whether at least one sector needs to be allocated to the data area.

According to another aspect of the present invention, there is provided a method of reproducing data from a write-once disc, comprising: accessing a predetermined area of the disc to read area allocation information, and obtaining information about a data area of the disc from the area allocation information. Information on the location of at least one sector allocated for disc defect management.

According to another aspect of the present invention, there is provided an apparatus for reproducing data from a write-once disc, comprising: a read unit that reads data from the disc; and a controller that controls the read unit to access a predetermined area of the disc for reading The area allocation information is fetched and information on the location of at least one sector of the data area of the disc, which is allocated for disc defect management, is obtained from the area allocation information.

Additional aspects and/or advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

These and/or other aspects and advantages of the present invention will become clear and easier to understand through the following description of the embodiments in conjunction with the accompanying drawings, wherein:

1A and 1B illustrate the structure of a write-once disc according to an embodiment of the present invention;

2 shows the structure of a single recording layer disc that allows management of a data zone according to an embodiment of the present invention;

Fig. 3 shows the detailed structure of the Temporary Disc Defect Structure (TDDS, Temporary Disc DefectStructure) area shown in Fig. 2;

Fig. 4 shows the detailed structure of the blank bit map (SMB, Space Bit Map) district of Fig. 2;

5 shows the structure of a single recording layer disc that allows management of data areas according to another embodiment of the present invention;

Fig. 6 shows the detailed structure of the TDDS+SBM area shown in Fig. 5;

7 shows the structure of a single recording layer disc that allows management of a data zone according to another embodiment of the present invention;

Fig. 8 shows the detailed structure of the Temporary Disc Management Area (TDMA, Temporary Disc ManagementArea) shown in Fig. 7;

Fig. 9 shows the detailed structure of the disk and drive information+SBM area shown in Fig. 7;

10 shows the structure of a single recording layer disc that allows management of data areas according to another embodiment of the present invention;

Fig. 11 shows the detailed structure of TDMA#1 shown in Fig. 10;

FIG. 12 shows a detailed structure of the cluster shown in FIG. 11 in which both TDDS and SBM are recorded;

FIG. 13 shows a detailed structure of clusters containing disc initialization information obtained during disc initialization;

Figure 14 shows the detailed structure of a cluster containing disc reinitialization information;

Figure 15 shows the structure of the SBM region according to an embodiment of the present invention;

Figure 16 shows a completed SBM zone according to an embodiment of the invention;

Figure 17 is a block diagram of a recording device according to an embodiment of the present invention; and

FIG. 18 is a flowchart illustrating a method of managing a data area of a write-once disc according to an embodiment of the present invention.

Detailed ways

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like numerals refer to like parts throughout. The embodiments are described below in order to explain the present invention by referring to the figures.

1A shows the structure of a write-once disc (hereinafter, referred to as 'disc') which is a single recording layer disc having a single recording layer L0 according to an embodiment of the present invention. The disc includes: a lead-in zone, a data area, and a lead-out zone. The lead-in zone is located on the inner ring of the disc, and the lead-out zone is located on the outer ring of the disc. The data area exists between the lead-in zone and the lead-out zone and is divided into a user data area and a spare area. The spare area has a predetermined size from the beginning of the data area.

FIG. 1B shows a disc which is a dual recording layer disc having two recording layers L0 and L1. From the inner circumference of the first recording layer L0 to its outer circumference, a lead-in zone, a data area, and an outer area are sequentially formed. Furthermore, from the outer circumference of the second recording layer L1 to its inner circumference, an outer area, a data area, and a lead-out zone are sequentially formed. Unlike the single recording layer disc of FIG. 1A, the lead-out zone of the second recording layer L1 appears on the inner circumference of the second recording layer L1. That is, the disc has an inverse track path (OTP) in which data is recorded from the lead-in zone at the inner circumference of the first recording layer L0 to the outer circumference, and continues to start from the outer area at the second recording layer L1 inward. Export of circles with records. Spare areas are allocated to the first and second recording layers L0 and L1, respectively.

In this embodiment, a spare area exists between the lead-in zone and the user data area and between the outer area and the user data area. However, the location and number of spare areas are not limited.

Initialization of the disc according to the present invention will now be described. Disc initialization is a preparatory recording operation performed prior to use of the disc. More specifically, information on the structure of the data area is written to a predetermined area of the disc, thereby ensuring that the recording/reproducing device recognizes the structure of the data area. This information specifies whether, for example, a spare area, an area in which data related to disc defect management using a recording/reproducing apparatus is recorded other than user data is allocated to the data area, and specifies the position of the area allocated to the data area . If disc initialization information, that is, information on the data area structure is recorded after disc initialization, the recording/reproducing device can check the presence and position of an area in which information other than user data is recorded, and detect that user data will The zone in which to record.

Hereinafter, an embodiment of a disc in which a spare area for disc defect management is formed in a data area according to the present invention will be described with reference to FIGS. 2 to 9 .

FIG. 2 shows the structure of a single recording layer disc allowing management of a data zone according to an embodiment of the present invention. Referring to Fig. 2, the lead-in zone of disc comprises: Defect Management Area (DMA, Defect Management Areas) DMA1 and DMA2, recording condition test area, Temporary Disc Defect Structure (TDDS, Temporary DiscDefect Structure) area, Temporary Defect List (TDFL, Temporary DeFect List) area, blank bitmap area, and disc and drive information area.

Generally, when a disc is loaded into a recording/reproducing device, the recording/reproducing device reads information from a lead-in tape and/or a lead-out tape to determine how to manage the disc and perform read/write operations. Therefore, if the amount of information recorded in the lead-in zone and/or the lead-out zone increases, it will take longer time to prepare for recording or reproduction of data after loading the disc. To solve this and/or other problems, the present invention proposes to contain TDDS and TDFL temporary management information, which is recorded in the formed TDFL or TDDS, separate from the lead-in and/or lead-out bands.

If there is no more data to be recorded on the disc, the recording/reproducing apparatus starts disc completion, during which TDFL and TDDS recorded are recorded in DMA as defect management information. By disc completion, only the most recently recorded TDFL and TDDS are copied to the DMA. Therefore, the recording/reproducing apparatus can quickly complete disc initialization by reading only the most recently updated information from the DMA. In this case, defect management information is stored in a plurality of areas, thereby improving reliability of information.

The disc defect management according to the present embodiment uses the linear replacement method, and therefore, the TDFL designates an area, ie, a defective area of the disc in which a defect occurs, and a replacement area that replaces the defective area. TDFL further specifies whether a defective region is a single defective cluster, or a contiguous defective cluster in which a series of defects physically occurs. It specifies the recording position of the TDFL for the TDDS that manages the information of the TDFL.

The lead-in zone includes a blank bitmap (SBM) area containing bitmap information on an area containing data, ie information on a data recordable area.

The data area includes spare areas #1 and #2 and a user data area.

In this embodiment, spare areas #1 and #2 are formed at the beginning and end of the data area, respectively, for the case of performing disc defect management using a recording/reproducing apparatus during disc initialization.

The lead-out zone includes DMA #3 and #4 and other areas.

When the user decides to perform disc defect management using the recording/reproducing device and instructs the recording/reproducing device to allocate a spare area in the data area, the recording/reproducing device allocates spare areas #1 and #2 to a predetermined part of the data area, for example, at The start and end of the data area. Thereafter, the recording/reproducing apparatus records area allocation information indicating allocation of spare areas #1 and #2 in the first cluster of the TDDS area. The area allocation information may specify the sizes of allocated spare areas #1 and #2. If the start and end addresses of spare areas #1 and #2 are determined, for example, when spare areas #1 and #2 are placed at the beginning and end of the data area, respectively, the recording/reproducing device can The information identifying the allocation of spare areas #1 and #2 and the location and size of each spare area.

When the start and end addresses of the spare areas #1 and #2 are not reserved, the start and end addresses are determined and recorded, or the information on the size of the spare areas #1 and #2 is recorded in the first cluster of the TDDS area .

In this embodiment, area allocation information is recorded in the TDDS area, but may also be recorded in another area.

After the area allocation information is recorded in the first cluster of the TDDS, a bitmap is recorded in the first cluster of the SBM area, the bitmap records the bit corresponding to the position of the first cluster of the TDDS and the SBM area as 1, and sets Bits corresponding to the positions of other clusters are recorded as 0.

If the user does not want to perform disc defect management using the recording/reproducing device, the recording/reproducing device records area allocation information describing the sizes of spare areas #1 and #2 as 0 in the first cluster of TDDS.

After the area allocation information is recorded in the TDDS, a bit map indicating bits corresponding to the positions of the first cluster of the TDDS and the SBM area with 1 and bits corresponding to the positions of other clusters with 0 is recorded in the first cluster of the SBM area. in a cluster.

As previously described, even if area allocation information is recorded in TDDS and data is recorded on the disc during previous disc initialization, the structure of the data area can be changed by reinitializing the disc and updating the area allocation information. Disc reinitialization will be described later with reference to FIG. 14 .

When the user does not need to use the disc defect management of the recording/reproducing apparatus, no information will be recorded in the DMA. In this case, even if disc finalization is not being performed, area allocation information recorded in the TDDS area is recorded in the DMA.

Meanwhile, rewritable discs do not include TDDS, and therefore, it is impossible to reproduce information from a disc with a TDDS area containing area allocation information using a reproducing device for rewritable discs due to an incompatible data structure. To solve this and/or other problems, the information recorded in the TDDS area is copied to the DMA when disc finalization is performed on the disc.

In other words, if the disc defect management using the recording/reproducing apparatus is not to be performed, the area allocation information recorded in the TDDS area before the disc is completed is recorded in the DMA, thereby ensuring that the disc is reproduced from the disc using a rewritable disc reproducing apparatus. Reproduce information.

FIG. 3 shows the structure of the TDDS zone shown in FIG. 2 according to an embodiment of the present invention.

TDDS is recorded into a cluster of the TDDS area at least once until the recording operation is stopped. Usually, a plurality of TDDS#0, TDDS#1, . . . are recorded in the TDDS area. In the present invention, when the recording operation is stopped, TDDS#0 is recorded once in the cluster of the TDDS area.

Referring to FIG. 3, a TDDS area includes a plurality of clusters. A cluster is a basic unit of recording and consists of a predetermined number of sectors. A sector is the physical basic unit of a disk.

During disk initialization, when a user determines whether a spare area will be allocated, area allocation information indicating the user's determination is recorded in TDDS#0. TDDS #0 includes a TDDS identifier, counter information indicating the number of updates to TDDS #0, location information on drive information, location information on the corresponding TDFL, and information on the size of the spare area #1 if any , and information on the size of the spare area #2. As previously described, when the user does not need to use the disc defect management of the recording/reproducing apparatus and allocates the spare area in the data area, the sizes of the spare areas #1 and #2 are recorded as '0'.

Although the detailed structure of the TDFL area is not shown, TDFL #i contains information on defects occurring in data recorded during recording operation #i and information on replacements for the defects. Furthermore, previous TDFL #0, #1, #2, ..., #i-1 are not accumulated in TDFL #i, and only about defects occurring in the recording area obtained during the corresponding recording operation #i The information of is recorded in TDFL #i, thereby minimizing the recording capacity and ensuring efficient use of the recording space of TDDS.

FIG. 4 shows the structure of the SBM region shown in FIG. 2 according to an embodiment of the present invention. The SBM area contains a plurality of clusters, and each SBM #i is recorded in a cluster.

Each SBM #i includes an SBM header area and a bitmap area. In the SBM header area, SBM identifier information, counter information indicating the number of updates to SBM#i, and a completion flag are recorded. The completion flag will be described later.

The bitmap area contains a bitmap which indicates clusters containing data and blank clusters with different bit values in units of clusters for the entire recordable area of the disc.

After recording TDDS#0, SBM#0 is recorded in the first cluster of the SBM area. In the bitmap of SBM#0, a bit corresponding to the position of the first cluster of TDDS and a bit corresponding to the position of the first cluster are represented by 1, and bits corresponding to the remaining clusters are represented by 0.

Therefore, recording the size information on the spare area in TDDS#0 allows the recording/reproducing apparatus to check the presence of the spare area and determine the position or size of the allocated spare area. In addition, the recording/reproducing apparatus can quickly identify the data-containing area and the blank area of the disc by recording SBM #0 after recording TDDS #0.

In the disc shown in FIG. 2, a TDDS area, a TDFL area, and an SBM area are formed separately, and TDDS, TDFL, and SBM are recorded therein in units of clusters, respectively. However, the recording of TDDS and SBM is not limited to these areas, ie, they can be recorded in different areas.

FIG. 5 shows the structure of a single recording layer disc allowing management of a data zone according to an embodiment of the present invention. In this embodiment, the lead-in zone includes an area in which both TDDS and SBM are recorded.

When the user wants to perform disc defect management using the recording/reproducing device and instructs the recording/reproducing device to allocate a spare area, the recording/reproducing device allocates spare areas #1 and #2 at the beginning and end of the data area at a predetermined size, respectively .

Then, the recording/reproducing device records allocation information indicating allocation of spare areas #1 and #2 in the first cluster of TDDS and SBM.

FIG. 6 shows a detailed structure of the TDDS+SBM area shown in FIG. 5 . Referring to FIG. 6, TDDS and SBM are recorded in clusters. TDDS contains size information on each spare area and SBM, that is, area allocation information, and SBM contains bitmap.

After recording the area allocation information in the first cluster of the TDDS+SBM area, the bitmap records the bit for the position of the first cluster of the TDDS+SBM area as 1, and records the bits for the positions of other clusters is 0.

FIG. 7 shows a structure of a single recording layer disk for managing a data area according to an embodiment of the present invention. In this embodiment, the lead-in zone includes: a temporary disc management area (TDMA) in which both TDFL and TDDS are recorded; and a disc and drive information+SBM area in which both disc and drive information and SBM are recorded. That is, TDFL and TDDS are recorded in clusters, and disc and drive information and SBM are recorded in clusters.

Similar to the embodiments described in FIGS. 2 and 5, the user determines to use the disc defect management of the recording/reproducing device and instructs the recording/reproducing device to allocate a spare area to the data area of the disc. Then, the recording/reproducing device allocates spare areas #1 and #2 to the beginning and end of the data area with a predetermined size.

Next, the recording/reproducing device records area allocation information indicating allocation of spare areas #1 and #2 in the first cluster of TDMA.

FIG. 8 shows a detailed structure of the TDMA shown in FIG. 7 . TDMA includes clusters in which disc defect management information is recorded. In each cluster, TDDS and TDFL are recorded. TDDS contains information on the location of the spare area, which is area allocation information.

FIG. 9 shows a detailed structure of the disk and drive information+SBM area shown in FIG. 7 according to an embodiment of the present invention.

Each cluster contains disk and drive information and SBM information. SBM information contains bitmaps.

Information on the spare area is recorded in the first cluster of TDMA. Next, the bitmap indicates bits for TDMA and disc and drive information and the first cluster of the SBM area with 1 and bits for the remaining clusters with 0.

FIG. 10 shows the structure of a single recording layer disc allowing management of a data zone according to an embodiment of the present invention. Unlike the discs according to the above-described embodiments, the disc of FIG. 10 includes TDMA #2 in the data area in addition to TDMA #1 in the lead-in zone.

TDMA#1 and TDMA#2 are different from each other because information updated before the disk is ejected from the recording/reproducing device or during disk initialization is recorded in TDMA#1, and information updated during recording data on the disk is operated with Units are recorded in TDMA#2. Here, the operation unit is a unit in which the verify-after-write method is performed. In the verify-after-write method, data is recorded in units of clusters and then verified.

If the TDMA is allocated only to the lead-in zone, the size of the TDMA is limited, thus making it difficult to frequently update information. The number of necessary information updates can be reduced by updating the TDDS when the disc is ejected from the recording/reproducing device. However, in this case, when the power supply for the recording/reproducing apparatus is interrupted due to an unexpected accident such as a power failure during the writing operation, the updating of the TDDS will be incompletely terminated.

To address this and/or other problems, the disc of FIG. 10 also includes TDMA #2 in the data zone. The TDDS is updated and recorded in units in which the verify-after-write method is performed, thereby making it prepared for failure in updating the TDDS due to interruption of power supply. Just before the disc is ejected, final defect information and status information on the disc are repeatedly recorded in both TDMA #1 and #2, thereby increasing the robustness of the information.

The reason why TDMA#2 is formed in the data area is that frequent updating of information in TDMA#2 requires TDMA#2 to be slack. On the other hand, TDMA#1 does not need to be slack, and thus is formed in the lead-in zone (or lead-out zone).

If the user does not need to use the disc defect management method of the recording/reproducing device, or does not require the allocation of TDMA#2 although the user wants to use the disc defect management method of the recording/reproducing device during disk initialization, TDMA#2 will not be allocated to the data zone, and zone allocation information indicating this information is recorded in TDMA#1.

FIG. 11 shows the detailed structure of TDMA #1 shown in FIG. 10 . Referring to FIG. 11, TDFL, TDDS, and SBM are recorded in TDMA#1. More specifically, both TDDS and SBM are recorded in cluster TDDS+SBM#k, and TDFL is recorded in another cluster (k is an integer greater than 0). TDMA#2 has the same structure as TDMA#1, and its detailed description will be omitted.

FIG. 12 shows a detailed structure of the cluster TDDS+SBM #k shown in FIG. 11 in which both TDDS and SBM are recorded. Referring to FIG. 12, TDDS designates a recording condition test area, drive information, TDFL, spare areas #1 and #2, TDMA #2, TDDS+SBM area for another recording layer, and TDDS+SBM for another TDMA area location.

If the start and end addresses of each area of the disc are determined, information on the sizes of spare areas #1 and #2 and TDMA #2 is sufficient as their location information. Otherwise, the location information is indicated with their start and end addresses corresponding to each zone of the disc.

If the disc has at least two recording layers, an SBM for each recording layer is required.

FIG. 13 shows the detailed structure of cluster TDDS+SBM#0 containing disc initialization information obtained during disc initialization. FIG. 13 shows a case where spare areas #1 and #2 and TDMA #2 are formed in the data area. Referring to FIG. 13, information on the size of spare areas #1 and #2 and TDMA #2 is recorded as disc initialization information. In this case, it can be understood that the start and end addresses of each area have been determined.

Even if a spare area is allocated to the data area and the disc is initialized by recording area allocation information indicating the allocation, the structure of the data area can be changed by reinitializing the disc and updating the area allocation information.

Fig. 14 shows the detailed structure of cluster TDDS+SBM#n+1 containing disc reinitialization information. Referring to FIG. 14, information specifying changes in sizes of spare areas #1 and #2 and TDMA #2 is recorded in the TDDS area.

Let us assume that spare area #1, TDMA #2, user data area, and spare area #2 are sequentially formed in the data area, and defect information is recorded in the spare area from the cluster with the largest address to the cluster with the smallest address. in District #2. In this case, disc reinitialization is performed to effectively use the recording area between the cluster with the largest address in the user data area and the cluster with the smallest address in spare area #2.

In other words, the disk reinitialization increases or decreases the size of the spare area #2, thus ensuring efficient use of the recording area.

Disk reinitialization information is recorded in at least one cluster TDDS+SBM belonging to TDMA#1 or TDMA#2.

Hereinafter, the SBM which is the information on the data recording area will be described in more detail.

FIG. 15 shows the structure of an SBM region according to an embodiment of the present invention. Referring to FIG. 15, SBM #0 to #n providing data recording area information are recorded in the SBM area. In this embodiment, SBM #i is recorded in clusters (i is an integer from 0 to n). However, as shown in FIGS. 6 to 9, SBM#i may be recorded in clusters together with other information.

Each SBM#i provides header information, which contains an SBM descriptor, a completion flag, and an update counter; and a bitmap #i (i is an integer from 0 to n), which indicates availability of the entire recording area of the disc in units of clusters. recording area.

If data is further recorded on the disc and the data recording area information is changed, each SBM #i containing a new bitmap describing the data recording area is generated and recorded. In this case, the update counter indicates the number of times the data recording area information is updated.

The instantaneous time when each SBM#i is generated and updated may be differently determined according to programs installed in the recording/reproducing apparatus. However, after recording data on the disc, a new SBM #i must be generated and recorded before ejecting the disc from the recording/reproducing device.

The completion flag indicates whether the disk is completed or not.

Figure 16 shows a completed SBM zone according to an embodiment of the present invention. The completion flag for the header of the SBM is set to 0 and recorded with other information. Referring to FIG. 16, the SBM recorded just before the disc is completed is SBM #n. If a completion command is given from a host computer such as a computer to the recording/reproducing device, the recording/reproducing device records the SBM#n again by changing the completion flag in the information on the last updated SBM#n from 0 to 1 Come to indicate the completion of the disc completion.

If necessary, the recording/reproducing apparatus may no longer allow SBM to be recorded by recording data such as "ffh" in the next area adjacent to the area containing SBM #n with completion flag '1', thereby preventing the additional data records.

The user can maintain the recording status of the disc at the instant when disc completion is performed based on the SBM with the completion flag '1'. Even if the data recorded on the completed disc is changed or new data is added to the original data without permission, it can be detected during disc completion by referring to the bitmap contained in the SBM with the completion flag '1' Recorded raw data. Therefore, data added after the disc is completed can be easily detected.

The area in which each SBM#i is recorded is placed in at least one of the data area, the lead-in zone, and the lead-out zone as shown in FIGS. 1A and 1B.

The spare area and TDMA are allocated to the data area in the above embodiments, but the area to which the spare area and TDMA are allocated and the area to which the data area is allocated are not limited. For example, a TDMA zone and a TDDS zone may also be allocated to the data zone. In addition, the TDDS area and the SBM area are allocated to the lead-in zone in the above-described embodiment, and may also be formed in the data area and the lead-out zone.

Although not shown in the drawings, a TDFL region may be formed in the data region. In this case, if the user wants to use disc defect management of the recording/reproducing apparatus, the user allocates spare area #1, spare area #2, and TDFL area as described above, and records TDDS and SBM. The TDFL can be placed between the lead-in zone and the spare area #1, between the spare area #1 and the user data area, in the middle of the user data area, between the user data area and the spare area #2, and between the spare area #1 and the user data area. Between zone #2 and the lead-out zone.

If the user does not want to use the disc defect management of the recording/reproducing apparatus, allocation of the spare area is not required. However, if a user records data in real time using disc defect information obtained by scanning the disc, a TDFL area is required to store the disc defect information. Therefore, TDFL is allocated during disk initialization.

In the above embodiments according to the present invention, the management of the spare area and the recording of the bitmap are described with respect to the single recording layer disc. However, the present invention can be applied to dual recording layer discs.

A write-once disc according to the present invention includes TDMA for disc defect management. However, if the disc is a rewritable disc, the disc includes DMA but not TDMA. Therefore, a rewritable disc recording/reproducing apparatus cannot reproduce data from and record data on a disc with TDMA, ie, cause compatibility problems of the disc. In order to solve the disc compatibility, the TDFL recorded in the TDDS area is copied to the TDMA before the completion of the disc.

Fig. 17 is a block diagram of a recording/reproducing device according to an embodiment of the present invention. Referring to FIG. 17 , the recording/reproducing apparatus includes: a recording/reproducing unit 1 , a controller 2 , and a memory 3 .

Under the control of the controller 2, the recording/reproducing unit 1 records data on the disc 100 according to the present invention, and reads data from the disc 100 to verify the accuracy of the recorded data.

The controller 2 manages the data area of the disc 100 . In addition, the controller 2 performs a verify-after-write method in which data is recorded on the disc 100 in predetermined units and the accuracy of the recorded data is verified to detect whether or not an area of the disc 100 is defective. More specifically, the controller 2 records user data on the disc 100 in predetermined units and verifies the recorded user data to detect an area of the disc 100 in which a defect exists. Next, the controller 2 creates a Temporary Defect List (TDFL) and a Temporary Disk Defect Structure (TDDS) specifying the location of a zone with defects. Next, the controller 2 temporarily stores the created TDFL and TDDS in the memory 3 . When the number of stored TDFLs and TDDSs reaches a predetermined level, the controller 2 records the TDFLs and TDDSs in a predetermined area of the disc 100, ie, a temporary disc management area (TDMA).

Here, the disk 100 includes the disk according to the foregoing embodiments of the present invention.

When the user wants to perform disk defect management using a recording device such as shown in FIG. A predetermined portion of the data area of the disc, eg at the beginning and end of the data area.

Then, the recording/reproducing device records area allocation information indicating allocation of spare areas #1 and #2 in the first cluster of the TDDS. The area allocation information may specify the sizes of allocated spare areas #1 and #2. If the start and end addresses of the spare areas #1 and #2 are determined, for example, when the spare areas #1 and #2 are respectively placed at the beginning and end of the data area, the recording device can identify the spare areas #1 and #2. 2, it is also possible to identify the positions and sizes of the spare areas #1 and #2 based only on the information on the size of the spare area.

For this reason, when the start and end addresses of the spare areas #1 and #2 are not determined, these addresses are determined and recorded or information on the size of the spare areas #1 and #2 is recorded in the first cluster of the TDDS.

A method of managing a data area of a disc using a recording apparatus according to an embodiment of the present invention will now be described with reference to FIGS. 17 and 18 .

FIG. 18 is a flowchart illustrating a method of managing a data area of the disc 100 according to an embodiment of the present invention. Before recording user data on the disc 100, initialization of the disc 100 is performed in response to user input (operation 110). Next, information on whether allocation of at least one sector of the data area of the disc 100 for disc defect management is required is transmitted from a host device such as a computer to the controller 2 (operation 120). As previously stated, the allocation of sectors of a data area such as a spare area or TDMA for disc defect management is considered to be well known to a person skilled in the art. Alternatively, a recording/reproducing device other than the host device can determine whether at least one sector of the data area is to be allocated.

Next, the controller 2 controls the recording/reproducing unit 1 to record area allocation information describing whether at least one sector of the data area has been allocated in a predetermined area of the disc 100 (operation 130). The extent allocation information may specify the size of at least one portion used for disk defect management.

Suppose, as shown in FIG. 2, at least one sector for disk defect management includes spare area #1 and spare area #2, and the start position of spare area #1 and the end position of spare area #2 have been respectively placed in The start and end of the data area. In this case, the recording device can recognize not only the allocation of spare areas #1 and #2 but also their positions and sizes based only on the information on spare areas #1 and #2.

When the user does not need disk defect management when using the recording device and does not allocate at least one sector of the data area such as the spare area, area allocation information indicating the size of at least one sector is recorded in a predetermined area of the disc 100 with 0 middle.

The zone allocation information may be recorded in TDDS formed in at least one of the lead-in zone, the data zone, and the lead-out zone of the disc 100 . In addition, TDDS can be recorded in different areas as shown in FIGS. 3 , 6 , 8 , and 12 .

After completing initialization of the disc 100 by recording zone allocation information on the disc 100 in operation 130, the recording apparatus may record user data on the disc 100 and perform disc defect management.

After operation 130, the recording apparatus records user data in the user data area of the disc 100, and performs disc defect management using the spare area and TDMA (operation 140).

Reinitialization of the disc 100 allows changing the structure of the data area of the disc 100 even after the disc initialization.

Next, the disc is re-initialized in response to user input (operation 150). Then, a command indicating that the structure of the data area is redefined by assigning a new area thereto is input from the host device to the controller 2 .

Next, the controller 2 controls the recording/reproducing unit 1 to record zone allocation information on the new zone in a predetermined zone of the disc 100, thereby updating the zone allocation information (operation 160).

Information on areas containing data such as SBM is recorded on the disc 100 . The header information of the SBM includes a done flag representing whether more data can be recorded on the disc. When the completion flag is 1, using the bitmap corresponding to the completion flag 1, a change in disc recording status can be checked and original data before the change can be detected.

If the user does not want to perform disc defect management using the recording device, no data is recorded in the DMA. Therefore, the area allocation information recorded in the TDMA is recorded in the DMA regardless of whether disc completion is completed or not.

Since a rewritable disc does not include a TDDS zone, it is impossible to reproduce data from a write-once disc with TDMA including zone allocation information using a rewritable disc reproducing device due to compatibility issues. To solve this and/or other problems, information recorded in TDMA during disk initialization is recorded in DMA, thereby ensuring disk compatibility.

If disc defect management using a recording device is not required, area allocation information recorded in TDMA before disc completion is recorded in DMA, thereby ensuring reproduction of data from a disc using a rewritable disc reproducing device.

For example, although not shown in the drawings, according to the present invention, a reproducing device reproduces data from a disc 100 containing area allocation information, has a structure similar to that of the recording device of FIG. 17, except that the reproducing device only includes Read the reproduction unit, not the recording/reproducing unit 1 of the recording/reproducing device. When the disc 100 is loaded into the reproducing apparatus according to the present invention, the reproducing apparatus accesses, for example, a predetermined area of TDMA containing the last updated area allocation information to read the last updated area allocation information. Next, the reproducing device obtains information on the location of at least one sector of the data zone used for disc defect management from the last updated zone allocation information. As mentioned above, the at least one sector includes TDMA and spare areas. Since the reproducing device can fully recognize the structure of the data area based on the area allocation area, the reproducing device can read not only user data but also data for disc defect management stored in the TDMA and spare areas allocated to the data area .

As described above, according to the present invention, area allocation information on the structure of the data area is recorded on the write-once disc, thus allowing the recording/reproducing apparatus to recognize the structure of the data area. Therefore, allocating an area such as a spare area for disc defect management other than the area for storing user data to the data area ensures efficient use of the disc.

In addition, after the disk is initialized, the structure of the data area may be changed by updating the area allocation information through the disk reinitialization.

In addition, a bitmap designating a data recordable area is recorded in a predetermined area of the disc, thereby ensuring that the recording/reproducing apparatus quickly accesses a desired area. The bitmap also allows the recording/reproducing device to check whether there is a change in the recording state of the disc and detect data that was originally recorded before the change, which occurred by recording additional data on the disc.

Although some embodiments of the present invention have been shown and described, those skilled in the art will appreciate that changes can be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is within the scope of the right. Requirements and their equivalents are defined.

Claims (18)

1. A recording and/or reproducing device comprising: a recording and/or reproducing unit that records data on or reads data from a write-once disc; and A controller that controls the recording and/or reproducing unit to record area allocation information indicating whether at least one sector of the data area of the disc is allocated for disc defect management in a predetermined area of the disc. 2. The apparatus of claim 1, wherein the region allocation information includes information specifying a size of the at least one sector. 3. The apparatus of claim 1, wherein the controller controls the recording and/or reproducing unit to record the zone allocation information in a temporary disc defect formed in at least one of a lead-in zone, a data zone, and a lead-out zone of the disc. structure (TDDS). 4. The apparatus of claim 1, wherein the controller controls the recording and/or reproducing unit to record information on the data recordable area in a predetermined area of the disc, Wherein, the information on the data recordable area includes bitmap indicating header information and the data recordable area. 5. The apparatus as claimed in claim 4, wherein the controller controls the recording and/or reproducing unit to record and store a predetermined value indicating whether at least one sector of the data area is assigned an area allocation indicating whether at least one sector of the data area is allocated. The bitmap value corresponding to the predetermined area of information. 6. The apparatus of claim 4, wherein the header information includes a finish flag indicating whether more data can be recorded on the disc. 7. The apparatus as claimed in claim 2, wherein the controller controls the recording and/or reproducing unit to allocate an area indicating a size of the at least one sector when at least one sector of the data area is not allocated. Information is recorded as 0. 8. The apparatus of claim 1, wherein the controller controls the recording and/or reproducing unit to record the area allocation information recorded in the Temporary Defect Management Area (TDMA) in the Defect Management Area (DMA). 9. The apparatus of claim 1, wherein the at least one sector comprises at least one of a spare area, a TDDS area, a TDFL area, and TDMA. 10. The apparatus of claim 1, wherein the controller controls the recording and/or reproducing unit to record area allocation information indicating allocation of the second TDMA to the data area in the first TDMA and second TDMA formed in the lead-in zone of the disc. One of the two TDMA. 11. The apparatus of claim 10, wherein the first TDMA is an area in which the updated TDDS is recorded at least once before the disc is ejected from the recording apparatus, and The second TDMA is an area in which updated TDDS is recorded in units of predetermined operations. 12. The apparatus as claimed in claim 1, wherein the controller controls the recording/reproducing unit to, in response to a command indicating that at least one sector is to be changed, set the area allocation information including information specifying a size of the at least one sector recorded in a predetermined area of the disc. 13. The apparatus of claim 3, wherein the controller controls the recording/reproducing unit to record the zone allocation information in at least one cluster from the beginning of the TDDS. 14. An apparatus for reproducing data from a write-once disc, comprising: a read unit, which reads data from the disk; and A controller that controls the read unit to access a predetermined area of the disc to read the area allocation information and obtain information on a location of at least one sector of a data area of the disc allocated for disc defect management from the area allocation information. 15. The apparatus of claim 14, wherein the zone allocation information includes information specifying a size of the at least one sector. 16. The apparatus of claim 14, wherein the disc further comprises: a first temporary defect management area (TDMA) formed in the lead-in zone and a second TDMA formed in the data area, Wherein, the area allocation information indicates allocation of the second TDMA to the data area, and the predetermined area in which the area allocation information is recorded is one of the first and second TDMAs. 17. The apparatus as claimed in claim 14, wherein the predetermined area storing the area allocation information is a TDDS area formed in at least one of a lead-in zone, a data zone, and a lead-out zone of the disc, and Zone allocation information is included in TDDS. 18. The apparatus of claim 14, wherein the at least one sector comprises at least one of a spare area, a TDDS area, a TDFL area, and TDMA.

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