CN1311439C - Method for overwriting data in write-once medium and device for data recording and/or reproduction thereof - Google Patents

Abstract

A method of overwriting data in a write-once information storage medium and a data recording and/or reproducing apparatus. In the data overwriting method, a command to overwrite new data in a first area of a write-once information storage medium where data has been recorded is issued. Then, the first area is regarded as a defective area, and data is recorded in the second area. Thereafter, updated defect management information, including information regarding the locations of the first and second areas, is recorded in the write-once information storage medium.

Description

Method for overwriting data in write-once medium and device for data recording and/or reproduction thereof

Technical field

The present invention relates to a write-once information storage medium, and more particularly, to a method of overwriting data in a write-once information storage medium and an apparatus suitable for data recording and/or reproduction of the write-once information storage medium .

Background technique

A rewritable information storage medium can overwrite new data in its area occupied by data. However, the write-once information storage medium can only write information only once in its data-storable area. Therefore, data cannot be overwritten in the write-once information storage medium, and already recorded data cannot be deleted or changed.

Typically, a predetermined area of a user data area of an information storage medium is set as a file system storing various information including data recorded in the information storage medium.

In a rewritable information storage medium, an updated file system can be overwritten on a predetermined area occupied by its old file system, so that the area for storing the file system is fixed. On the other hand, the write-once information storage medium cannot be overwritten. Therefore, it is necessary to write the updated file system in an area other than the area in which the old file system has been recorded. Since a conventional data recording and/or reproducing apparatus is designed to read a file system only from a fixed area in an information storage medium, the conventional system cannot read a file from a write-once information storage medium in which the recording position of the file system changes. system. In other words, reproduction compatibility problems may occur. Furthermore, since a conventional data recording and/or reproducing device writes each updated file system in a different area of a write-once information storage medium, the conventional device may spend a lot of time searching for a final file system.

Contents of Invention

The present invention provides a method of overwriting data in a write-once information storage medium that is not physically overwritable, and a data recording and/or reproducing apparatus thereof.

The present invention also provides a method for logically overwriting data in a write-once information storage medium that is not physically overwritable, thereby easily updating and/or reading out data, and a data recording and/or reproducing apparatus thereof.

According to an aspect of the present invention, the method for overwriting data in a write-once information storage medium includes: receiving an order to overwrite new data in a first area of a write-once information storage medium in which data has already been recorded; determining the first The zone is a defective zone and new data is recorded in the second zone; updated defect management information including position information on the first and second zones is recorded in the write-once information storage medium.

According to another aspect of the present invention, the method for overwriting data in a write-once information storage medium includes: receiving a logical address from a host to store new data; Whether the first area of the address is occupied by data, and if the first area is occupied by data, then determining that the first area is a defective area and storing new data in a second area whose physical address is different from that of the first area; Updated defect management information including physical addresses of the first and second areas is recorded in the write-once information storage medium.

According to another aspect of the root invention, there is provided a data recording and/or reproducing apparatus including a writer/reader and a controller. The writer/reader writes data to the write-once information storage medium or reads written data. When the controller receives a command to overwrite new data in the first area of the write-once information storage medium in which data has already been recorded, the controller determines that the first area is a defective area and controls the writer/reader in the second area Record new data in. The controller controls the writer/reader to write updated defect management information including information on locations of the first and second areas in the write-once information storage medium.

According to another aspect of the present invention, there is provided a data recording and/or reproducing apparatus including a writer/reader and a controller. The writer/reader writes data to the write-once information storage medium or reads written data. The controller receives a logical address on the write-once information storage medium from the host to store new data, and determines whether a first area having a physical address on the write-once information storage medium corresponding to the logical address is occupied by data. If the first area is occupied by data, the controller determines that the first area is a defective area and controls the writer/reader to write new data into a second area having a physical address different from that of the first area, And write updated defect management information including physical addresses of the first and second areas in the write-once information storage medium.

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

Description of drawings

The above-mentioned and/or other characteristics and advantages of the present invention will become clearer and easier to understand from the following description of the embodiments in conjunction with the accompanying drawings, in which:

1 shows a data structure of a write-once information storage medium with a single recording layer according to an embodiment of the present invention;

2 shows a data structure of a write-once information storage medium with a single recording layer according to another embodiment of the present invention;

3A and 3B represent data structures of a write-once information storage medium having two recording layers according to another embodiment of the present invention;

4A and 4B represent the direction of use of the spare area according to the present invention;

5 is a block diagram of a data recording and/or reproducing device according to an embodiment of the present invention;

6A to 6D represent a method for overwriting an updated file system on a write-once information storage medium 100 according to an embodiment of the present invention;

FIG. 7 shows a defect list generated by first logic overwriting according to the embodiment of FIGS. 6A to 6D;

FIG. 8 shows a defect list generated by a second logic overwrite according to the embodiment of FIGS. 6A to 6D .

Detailed ways

Specific embodiments of the invention will now be discussed in detail, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. Hereinafter, the embodiments of the present invention are described in order to explain the present invention by referring to the figures.

FIG. 1 shows the structure of a write-once disc information storage medium 100 having a single recording layer according to an embodiment of the present invention. Referring to FIG. 1 , the storage medium 100 includes a lead-in area 120 , a data area 130 and a lead-out area 140 . The area 121 is formed in the lead-in area 120 for recording a temporary disc defect structure (TDDS) and a space bit map (SBM). A separate area 122 is also formed in the lead-in area 120 for a temporary defect sequence (TDFL). Spare areas 1 and 2 (133 and 134, respectively) are formed at the head and tail of the data area 130, respectively, and are allocated to manage temporary disk defects and have a predetermined size.

Alternatively, the area 121 for TDDS and SBM may be formed in at least one of the lead-out area 140 and the data area 130 .

The scratch disk defect management, the spare area allocated for the scratch disk defect management, and the SBM will be described in detail below. Disc defect management represents an operation in which, if a defect occurs in user data recorded in the user data area 135, new user data corresponding to the defective user data is recorded to compensate for data loss due to the generated defect.

Disk defect management is roughly classified into disk defect management with a linear replacement technique or disk defect management with a sliding replacement technique. In the linear replacement technique, if a defect occurs in the user data area of the data area, the defective area will be replaced by a non-defective spare area allocated in the data area. In the sliding replacement technique, a defective area is skipped, ie, the area is not used and replaced by a non-defective area.

The linear and sliding replacement techniques are widely used in information storage media, such as DVD-RAM/RW, in which data can be recorded multiple times by a random access method.

As shown in FIG. 1, the write-once information storage medium 100 according to the embodiment of the present invention also allocates spare areas 1 and 2 (133 and 134) in the data area 130 for performing defect management using the linear replacement technique. Spare areas 1 and 2 (133 and 134) are allocated in the data area 130 according to a command of a data recording and/or reproducing apparatus or a host when initialization prepares to apply the write-once information storage medium.

When an information storage medium is loaded on a data recording and/or reproducing device, the data recording and/or reproducing device reads out the information stored in the lead-in and/or lead-out area, and determines how to manage the medium and how to store information in the medium. Record or reproduce data. When the amount of information recorded in the lead-in and/or lead-out area increases, the time required for preparing data recording or reproduction also increases after the information storage medium is loaded. In order to reduce the time required to prepare for data recording and/or reproduction, the write-once information storage medium 100 in FIG. 1 utilizes temporary management data including TDDS and TDFL.

The TDDS may include an identifier of the TDDS, an update counter, data on the location of the final TDFL that has been recorded, location data on the final disk and drive information that has been recorded, data on the size of the spare area used to replace defective clusters data, etc.

A TDFL may include a TDFL identifier, an update counter, a defect factor, a number of defect factors, and the like. Defect factors include: status data, location data about defective clusters, and location data about replacement clusters. Status data may indicate replacement data, types of defective clusters, and the like. The types of defective clusters may include defective clusters that must be replaced, defective clusters that do not have to be replaced, and possibly defective clusters, among others.

The write-once information storage medium 100 of FIG. 1 stores SBM, ie, "recording status" data, which indicates whether data is recorded on a cluster unit of the write-once information storage medium. The SBM is formed by assigning a bit value of 0 to occupied clusters and a bit value of 1 to unoccupied clusters.

Therefore, the data recording and/or reproducing apparatus can quickly check the recording status of the write-once information storage medium of FIG. 1 by referring to the finally updated SBM. Therefore, the efficiency of the use of the medium is improved.

Although, the write-once information storage medium 100 in FIG. 1 stores SBM and TDDS on one cluster, the present invention is not limited to this embodiment.

Since the SBM indicates whether data has been recorded in the cluster unit of the write-once information storage medium 100, the SBM must be finally updated after all other data including user data is recorded.

FIG. 2 shows the structure of a write-once information storage medium 200 having a single recording layer according to another embodiment of the present invention. Referring to FIG. 2 , the storage medium 200 includes: a lead-in area 220 , a data area 230 and a lead-out area 240 . In the lead-in area 220, a temporary disk management area (TDMA) 221 and an SBM area 222 are allocated separately. Spare areas 1 and 2 (respectively 233 and 234 ) are allocated at the head and tail of the data area 130 respectively, are used to manage temporary disk defects, have a certain size, and surround the user data area 235 .

TDMA 221 is defined to store TDDS and TDFL, and SBM area 222 is defined to store spatial bitmap data in a manner similar to that described above.

3A and 3B illustrate a data structure of a write-once information storage medium 300 having first and second recording layers L0 and L1 according to still another embodiment of the present invention. FIG. 3A shows the structure of the first recording layer L0, and FIG. 3B shows the structure of the second recording layer L1. FIG. 3A can be considered as a structure of a write-once recording medium having a single layer.

The data structure of the first recording layer L0 of FIG. 3A is the same as that of the write-once information storage of FIG. The structure of the medium 200 is similar. The structure of the second recording layer L1 of FIG. 3B is the same as that of the first recording layer L0 of FIG. 3A. The inner area 0 (321) includes the TDMA 321 of the first recording layer L0, and the inner area 1 (350) includes the TDMA 351 of the second recording layer L1. Data area 0 (330) includes spare area 1 (331), user data area (331) and spare area 2 (332). Data area 1 (360) includes spare area 3 (363), user data area (365) and spare area 4 (364).

4A and 4B show the usage directions of the spare areas (133, 134, 233, 234, 331, 332, 363, 364) according to the present invention. Figure 4A relates to a write-once recording medium (eg: 100, 200) with a single recording layer, and Figure 4B relates to a write-once recording medium (eg: 300) with two recording layers (ie: first and second recording layers) ). 4A and 4B, in the first recording layer (or a single recording layer), the data area except the spare area, that is, the use direction 401 of the user data area (135, 235, 333) is from the recording medium (100, 200 , 300) from the inner boundary 402 to the outer boundary 403. In the second recording layer, the usage direction 405 of the user data area 365 is from the outer boundary 403 to the inner boundary 402 of the recording medium 300 .

As shown in FIG. 4A, the spare area 2 (135, 235, 333) is used in a direction 406 opposite to the recording direction 401 of user data, that is, from the outer boundary 403 to the inner The direction of the boundary 402 is thus easily extended. As shown in FIG. 4B, the spare area 4 (364) is used in the direction 407 from the inner boundary 402 to the outer boundary 403 of the recording medium 300, thereby being easily expanded.

As described below, a write-once information storage medium according to the present invention may require a wider spare area than a conventional information storage medium, and logical overwriting is performed in order to use defect management according to the present invention. Therefore, it is preferable, but not necessary, to expand the spare area when initializing the information storage medium or during the use of the information storage medium. In order to expand the spare area during use of the information storage medium, it is preferable, but not necessary, to record data in the spare area in a direction opposite to the direction in which user data is recorded as shown in FIGS. 4A and 4B.

Now, methods of overwriting data according to two embodiments of the present invention will be described in detail with reference to the information storage medium 300 shown in FIGS. 3A and 3B .

In the method of overwriting data according to an embodiment of the present invention, data may be overwritten in a write-once information storage medium that cannot be physically rewritten using a logical overwriting technique.

FIG. 5 is a block diagram of an apparatus 500 for data recording and/or reproducing according to an embodiment of the present invention. As shown in FIG. 5 , the device 500 includes a writer/reader 510 , a controller 520 and a memory 530 . The write-once information storage medium 300 is the same as the write-once information storage medium of FIG. 3A.

The writer/reader 510 writes data to the write-once information storage medium 300 under the control of the controller 520, and reads the written data from the write-once information storage medium to verify the data.

The controller 520 performs defect management using TDMA included in the write-once information storage medium 300 when recording and/or reproducing data on the write-once information storage medium 300 .

The controller 520 follows a verify-after-write process that, after recording data in a predetermined unit of the write-once information storage medium 300, verifies the recorded data to find defective data. Accordingly, the controller 520 records user data in predetermined units and verifies the recorded user data to identify defective data. The controller 520 generates TDFL and TDDS representing areas storing defective data found in the verification process. The controller 520 stores the TDFL and TDDS in the memory 530, collects a predetermined number of TDFL and TDDS, and writes the collected TDFL and TDDS into the TDMA 321 allocated in the write-once information storage medium 300.

Now, the above-mentioned overwriting of data in the write-once information storage medium 300 by the data recording and/or reproducing apparatus 500 of FIG. 5 is described in more detail by taking an updated file system as an example of data to be overwritten.

If a data recording and/or reproducing apparatus performs defect management to record and/or reproduce data in a write-once information storage medium, a file system recorded in the write-once information storage medium may be updated through defect management. In other words, the data recording and/or reproducing apparatus 500 receives data on the updated file system and a logical address of the write-once information storage medium from the host to store the updated file system, and thereafter checks the logical address from the SBM. Whether the corresponding physical address is occupied by data. The SBM is read in advance from the write-once information storage medium by the writer/reader 510 and stored in the memory 530 . If it is determined that the physical address is occupied by data, the area having the physical address is determined to be a defective area. Then, the updated file system is recorded in the spare area allocated to replace the defective area.

If the data recording and/or reproducing device 500 does not use this SBM, then the recording and/or reproducing device 500 can determine that the occupied data area is a defective area through a post-write verification method, and then record an update file in the spare area. system. Thereafter, the updated TDDS and the updated TDFL are recorded in the TDMA 321.

6A to 6D illustrate a method of overwriting an updated file system in the write-once information storage medium 300. Referring to FIG. In the method described with reference to FIGS. 6A to 6D, the first and second spare areas 331 and 332 are determined as SA1 and SA2, and allocated at the head and tail of a data area (eg, data area 330). Also, an area for storing the file system is allocated at the head of the user data area 335 .

In FIG. 6A, an initial file system FS#0 is recorded in the alignment area from the head of the user data area 335 to a predetermined position. In FIG. 6B, in the user data area 335, the first user data 601 is recorded next to the initial file system FS#0, and then, according to the above-mentioned overwriting method of the embodiment of the present invention, the defect management data is recorded in the second spare area SA2. After that, the first updated file system FS#1 is generated. In FIG. 6C, in the user data area, the second user data 602 is recorded next to the first user data 601, and then the second updated file system FS#2 is recorded next to the first updated file system FS#1. In FIG. 6D, in the user data area 335, the updated second user data 603 is recorded next to the second user data 602, and then the third updated file system FS#3 is recorded next to the second updated file system FS#2. .

The second spare area SA2 in FIG. 6D extends from the second spare area SA2 shown in FIGS. 6A to 6C. In other words, when the second spare area SA2 of FIG. 6A is used up, the second spare area SA2 of FIG. 6A may be extended by reinitializing the write-once information storage medium 300 . In order to easily extend the spare area like SA2, the use direction of the spare area, ie, the direction in which data is recorded in the spare area, is set to be opposite to the direction in which data is recorded in the user data area, ie, 335.

Even if the above-mentioned logical overwriting is continued on the same logical sector number (LSN), the amount of data included in the defect list does not increase. For example, assume that LSNs corresponding to physical sector numbers (PSNs) 100h to 1FFh in the user data area are 00h to FFh, and an initial file system is recorded in PSNs 100h to 1FFh. LSN represents the address of the logical sector, and PSN represents the address of the physical sector.

In this way, because additional user data is recorded in the write-once information storage medium, the host issues a command to the data recording and/or reproducing device 500 of FIG. 5 to overwrite the first update on the LSN00h to FFh where the initial file system is recorded. File system. If it is determined that LSNs 00h to FFh are occupied by data using the SBM or through a post-write verify process, the data recording and/or reproducing apparatus determines sectors corresponding to PSNs 100h to 1FFh as defective areas. Then, the data recording and/or reproducing apparatus records the first updated file system (FS#1) in the spare area (eg SA2). FIG. 7 illustrates a defect list generated by the first logic override in the method of FIGS. 6A to 6D . Referring to FIG. 7, the sector corresponding to PSN 100h to 1FFh where the initial file system is recorded is determined to be a defective sector, and the replacement sector for the defective sector is PSN 11FFFh to 11F00h in the spare area (eg, SA2).

When the first updated file system is recorded in the sectors LSN 00h to FFh by the first logical overwrite, and then additional user data is recorded in the write-once information storage medium, the host computer commands the data recording and/or reproducing device to record the data in the sectors LSN 00h to FFh The second update file system is overwritten in area LSN 00h to FFh. When it is determined that the sectors corresponding to the LSNs 00h to FFh are occupied by data using the SBM or through the post-write verification process, the data recording and/or reproducing apparatus determines the sectors corresponding to the PSNs 100h to 1FFh as defective sectors. Then, the data recording and/or reproducing apparatus 500 records the second updated file system (eg, FS#2) in the spare area (eg, SA2).

FIG. 8 illustrates a defect list generated by the second logic override in the method of FIGS. 6A to 6D . Referring to FIG. 8, the sector corresponding to PSN 100h to 1FFh where the initial file system is recorded is determined to be a defective sector, and the replacement sector for the defective sector is PSN 11EFFh to 11E00h in the spare area (eg, SA2).

Comparing the defect lists of Figures 7 and 8, although a defect list is generated each time an overwrite is performed on the same LSN, only the The PSN of the replacement sector is changed.

Now, a method of overwriting data in a write-once information storage medium according to another embodiment of the present invention will be described in detail. In this embodiment, data overwriting is performed using the file system.

In order to perform this overwriting, the data recording and/or reproducing apparatus 500 of FIG. 5 receives a command from the host to reproduce data recorded in sectors LSN 00h to FFh, accesses the PSN corresponding to the LSN, for example, 100h to 1FFh to read data, and transmit the read data to the host.

When the host tries to correct data received from the data recording and/or reproducing device and then records the corrected data in the write-once information storage medium 300, or tries to additionally record data from the data recording and/or When reproducing data received by the device, the data recording and/or reproducing device 500 transmits the SBM, defect information, and the like to the host. By referring to SBM, defect information, etc., considering the status of the user data area (ie, 333) logically allocated data and the physical recording condition of the user data area, the host distinguishes the recordable data area from the non-recordable data area, thereby selecting a recordable data area. overwrite area. In other words, the overwriting method according to this embodiment of the present invention is characterized in that the host selects the overwritable area.

Industrial Applicability

The overwriting method according to the latter embodiment of the present invention is suitable for a write-once information storage medium having a user data area with a large storage capacity. The overwriting method according to the previous embodiment of the present invention prevents consumption of the user data area by overwriting new data in the spare area used in defect management.

As described above, in the present invention, overwriting can be performed in a write-once information storage medium in which physical overwriting is impossible by applying a logical overwriting technique. Therefore, data recorded in the write-once information storage medium can be changed or updated. Also, when the data recorded in the fixed area of the write-once information storage medium is required, for example, when the file system is updated, the updated file system is recorded at a physical address different from the physical address where the original file system was recorded. , but the logical address of the file system recording the update is the same as the logical address of the original file system recording. Therefore, the host recognizes that the file system is always recorded in a fixed area, thereby easily accessing and reproducing the file system.

Although a few embodiments of the present invention have been shown and described, those skilled in the art can understand that the embodiments of the present invention can be changed without departing from the principles and essence of the present invention, and the scope of the present invention is defined in the claims book and its equivalents.

Claims (16)

1, a kind of method that in write-once information storage medium, overrides data, this method comprises:

Receive in first district of order with the write-once information storage medium of recorded data therein and override new data;

Determine that this first district writes down new data for defect area and in second district of record data not;

Record comprises the defect management information about the renewal of the information of the position in first and second districts in write-once information storage medium.

2, the method for claim 1, wherein the record of new data comprises: utilize by distinguishing data field that is occupied and the district that is not occupied and represent that the recording status information of the recording status of this write-once information storage medium determines whether first district is occupied by data.

3, method as claimed in claim 2, wherein recording status information is bunch bitmap that produces that occupies and do not occupied by the quilt that different bit values is assigned to write-once information storage medium.

4, the method for claim 1, wherein the record of new data comprises: new data is write first district and at this new data that writes of verification thereafter, and determine that according to the check results of new data first district is a defect area.

5, the method for claim 1, the data that wherein are previously recorded in first district are previous file system, and will be recorded in the file system of new data for upgrading in second district.

6, method as claimed in claim 5, wherein second district is included in the spare area, and this spare area is dispensed in the data field of write-once information storage medium.

7, method as claimed in claim 6, wherein the information about the file system upgraded is recorded in the spare area in the opposite direction with the side with the user data record.

8, a kind of data recording and/or reproducer comprise:

Write device/reader is used for that data are write write-once information storage medium and maybe the data that write is read; With

Controller, be used for when the reception order overrides new data in first district, first district that determines the write-once information storage medium that occupied by data is a defect area, control write device/reader is write second district with new data and the defect management information that upgrades is write in the write-once information storage medium, and the defect management information of this renewal comprises the information about the position in first and second districts.

9, equipment as claimed in claim 8 also comprises storer, is used to store by distinguishing data field that is occupied and the district that is not occupied represent the recording status information of the recording status of this write-once information storage medium,

Its middle controller utilizes recording status information to determine whether first district is occupied by data.

10, equipment as claimed in claim 9, wherein recording status information is bunch bitmap that produces that occupies and do not occupied by the quilt that different bit values is assigned to write-once information storage medium.

11, equipment as claimed in claim 8, its middle controller control write device/reader is write new data in first district, reads new data from first district with this new data of verification, and determines that according to the check results of new data first district is a defect area.

12, equipment as claimed in claim 8, the data that wherein are previously recorded in first district are previous file system, and will be recorded in the file system of new data for upgrading in second district.

13, equipment as claimed in claim 12, wherein second district is included in the spare area, and this spare area is dispensed in the data field of write-once information storage medium.

14, equipment as claimed in claim 13, its middle controller control write device/reader will be write in the spare area with the side with user data in the opposite direction about the information of the file system upgraded.

15, the method for the data of a kind of management in write-once information storage medium, this method comprises:

The specific data district and with first data storage in the first of data field;

Storage is used to discern the original document structure of position of first data of storage in the second portion of data field;

Storage second data in the first of data field;

Storage is used for being identified in the file structure of renewal of the position of first data field, first and second data in the third part of data field.

16, method as claimed in claim 15, wherein the direction of storage first and second data is opposite with the direction of the file structure of storing initial file structure and renewal in storage medium in storage medium.

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