JPH11353857A - Optical disc device and method for repairing optical disc - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disc device and a repairing method of optical disc in which an optical disc having been in an unreadable state due to the recording state of data at an additional recording part can be repaired to a readable state. SOLUTION: In the optical disc device having a repairing means 8 of writing once optical disc, the repairing means comprises a means 9 for reading out management information for a plurality of management section areas of an optical disc and deciding whether the management information thus read out is normal or not, a duplicate recording means 10 for recording an undecodable signal in a designated area, and a means 11 for instructing the duplicate recording means to bring the management information obtained from the means 9 and management information specified by external request of erasure into unreadable state by designating an area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus for recording and reproducing data by connecting to a computer or the like, and a method for repairing the optical disk.

[0002]

2. Description of the Related Art A write-once optical disc has a characteristic that data can be recorded only once in the same position. Therefore,
When additional recording is to be performed on an optical disk in which some areas have already been recorded, recording is sequentially performed in a donut shape on an area on which recording has not yet been performed. When recording is performed, management information necessary for reading data is recorded in addition to the main data. For this reason, on the optical disk on which additional recording has been performed, there are a plurality of management division areas, which are areas in which management information and main data are recorded together. Taking a CD-Recordable disc as an example, a session corresponds to a management division area, and lead-in information (TOC (Table Of Contents) information) and volume description information correspond to management information.

In order to record data on an optical disc having such a structure, a write-once optical disc apparatus has a function of reading management information, a function of checking a recordable area, and a function of recording data in a designated unrecorded area. I have.

[0004] When recording on a write-once optical disc, an optical disc in which some data cannot be normally read may be created. For example, such a case occurs when recording is stopped halfway, when there is a defect on the optical disk, or when incorrect data is recorded. Since the structure of such an optical disk is abnormal, depending on the optical disk device, it may not be possible to read data of other portions recorded normally. This is because, in general, when reading data from an optical disk, management information in all management division areas is read in order to know how the data is arranged on the optical disk.

FIG. 6 is a plan view showing an optical disk having two management division areas. In FIG. 6, reference numeral 101 denotes a first management section area, and 102 denotes a second management section area. It is assumed that the first management section area 101 is normally recorded, but the second management section area 102 is not normally recorded. If inconsistency arises in the management information due to the fact that the second management section area 102 is not recorded normally, the optical disc reader may determine that the entire optical disc is of an incorrect format. As a result, a situation arises in which not only the data in the second management partition area 102 but also the data in the first management partition area 101 cannot be read.

[0006]

As described above, the conventional optical disk device has a problem that data other than the additional recording portion cannot be read because the data of the additional recording portion is not recorded normally. I was

In the optical disk apparatus and the optical disk repair method, it is necessary to repair an optical disk in which data other than the additional recording part cannot be read because the data of the additional recording part is not normally recorded. Have been.

The present invention is directed to an optical disk apparatus capable of restoring an optical disk in which data other than the additional recording portion becomes unreadable because the data of the additional recording portion is not recorded normally, and It is an object of the present invention to provide an optical disc repair method for restoring an optical disc in which data other than the additional recording portion becomes unreadable because the data of the additional recording portion is not normally recorded.

[0009]

SUMMARY OF THE INVENTION In order to solve such a problem, an optical disk apparatus according to the present invention divides a disk surface of an optical disk for management of data recording / reproducing, and has a write-once type having a plurality of management division areas. An optical disc device having a restoration processing unit for restoring an optical disc, comprising:
The restoration processing means reads management information for a plurality of management division areas of the optical disc and determines whether the read management information is normal or not, and a management information reading processing means for recording an undecodable signal in a designated area. An area is designated to instruct the dual recording processing means to make the management information obtained by the recording processing means and the management information read processing means and the management information specified by the external erasure request unreadable. A management information erasing unit.

As a result, an optical disk apparatus can be obtained which can restore an optical disk in which data other than the additional recording portion becomes unreadable because data in the additional recording portion is not normally recorded.

An optical disk repair method according to the present invention for solving the above-mentioned problem is an optical disk for a write-once optical disk having a plurality of management division areas by dividing the surface of the optical disk for management of data recording and reproduction. A restoration method, wherein a management information reading step for reading management information for a plurality of management division areas of an optical disc to determine whether the management information is normal or not, and specifying the management information obtained in the management information reading step and an external erasure request. A management information erasing step for instructing that the management information to be rendered unreadable, and a double recording step for recording an undecodable signal at the position of the management information instructed to be unreadable. Is provided.

Thus, there is provided an optical disk restoration method for restoring an optical disk in which data other than the additional recording portion becomes unreadable because the data of the additional recording portion is not normally recorded.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical disk apparatus according to a first aspect of the present invention restores a write-once optical disk having a plurality of management division areas by dividing the optical disk surface for management of data recording and reproduction. An optical disc device having a restoration processing unit, wherein the restoration processing unit reads management information for a plurality of management division areas of an optical disc, and determines whether or not the read management information is normal. The double recording processing means for recording the unusable signal in the designated area, and the area for making the management information obtained by the management information reading processing means and the management information specified by the external erasure request unreadable. Management information erasure processing means for designating and instructing the dual recording processing means, thereby enabling normal recording to be performed. Specify the location of the management information of the management division region not, has the effect of un-decodable signal can be recorded at that position.

According to a second aspect of the present invention, there is provided a method for restoring an optical disk.
An optical disc repair method for a write-once optical disc having a plurality of management division areas by dividing a surface of an optical disc for management of data recording / reproduction. A management information reading step of determining whether or not the management information obtained by the management information reading step and the management information specified by the external erasure request are in an unreadable state; and
A double recording step of recording an undecodable signal at the position of the management information instructed to be in an unreadable state, whereby the management division area which is not recorded normally Has the effect that the position of the management information is designated and an undecodable signal can be recorded at that position.

(Embodiment 1) FIG. 1 is a block diagram showing an optical disk apparatus according to an embodiment of the present invention.

In FIG. 1, 1 is an optical head for reading a signal recorded on an optical disk and recording a signal on the optical disk, 2 is a data decoding unit for decoding data from the read signal, and 3 is a recording from the read signal. A position information detecting section for detecting reproduction position information, 4 is an optical head moving section for moving the optical head section 1 in the radial direction of the optical disk, 5 is a data encoding section for creating a signal to be recorded on the optical disk, and 6 is an external device. Interface section for exchanging data with the
Reference numeral 7 denotes a system control unit that controls each unit of the optical disk device, 8 denotes a restoration processing unit that constitutes the system control unit, 9 denotes management information reading processing unit that constitutes the restoration processing unit 8,
Numeral 10 designates double recording processing means constituting the restoration processing means 8, 1
Reference numeral 1 denotes management information erasure processing means constituting the restoration processing means 8. The function of the restoration processing means 8 can be realized by a microcomputer and a control program.

The operation of the restoration processing means 8 of the optical disk device thus configured will be described with reference to FIGS. 2 is a flowchart showing the operation of the management information reading processing means 9 of FIG. 1, FIG. 3 is a flowchart showing the operation of the double recording processing means 10 of FIG. 1, and FIG. 4 is a management information erasing processing means 11 of FIG. 6 is a flowchart showing the operation of the first embodiment.

First, the operation of the management information reading processing means 9 (management information reading processing step) will be described.

The management information reading processing means 9 detects what management division area the optical disc is divided into, and detects in which area on the optical disc surface the management information is located. Generally, the management information of a write-once optical disc includes information indicating which area on the optical disc the management division area occupies, and information indicating a position where the next management information exists. Therefore, by reading the first management information, the position where the second management information exists can be known, and by knowing the location of the second management information, the position where the third management information exists can be found. You can know. The position where the first management information exists is determined by the format of the optical disk and the format of the management information. The last management information indicates an unrecorded area where the management information is to be recorded next. Therefore, by reading the management information until it cannot be read correctly (that is, up to the data in the unrecorded area), it is possible to obtain the management information of all the management division areas. If the management information is not in the correct format, the management information is not used, and a management partition area other than the management partition area specified by the normally read management information is treated as the last management partition area. Therefore, the final management division area includes an unrecorded area and an area in which data in an incorrect format is recorded.

Next, the operation of the management information reading processing means 9 will be described with reference to the flowchart of FIG. First, the position of the management information in the first management division area is set as the movement target position (S1). Next, the optical head is moved to the movement target position (S2). Next, data is decrypted and management information is read (S3). Next, it is determined whether the management information has been correctly read (S4). If it is determined that the information has been correctly read, the position of the next management information is obtained from the correctly read management information (S5), and the movement target position is set as the position of the next management information (S6). If it is determined in step 4 that the management information has not been correctly read, the remaining area is set as the last management division area (S7), and the process ends.

Next, the operation of the double recording processing means 10 (double recording processing step) will be described. The double recording processing means 10 records a signal that cannot be decoded in a designated area on the optical disk surface. The signal that cannot be decoded is generated by the data encoding unit 5. As a signal that cannot be decoded, a random signal, a signal having a cycle different from that of a normal recording signal, or the like can be used. In order to position the optical head at a desired position, position information obtained by the position information detection unit 3 is used. The position information detecting section 3 obtains position information by decoding a signal engraved on the optical disk in advance. Thus, the optical head can be correctly positioned even in an area where data cannot be read normally.

Next, the operation of the double recording processing means 10 will be described with reference to FIG.
A description will be given based on the flowchart of FIG. First, the optical head is moved to the position of the management information designated by the management information erasure processing means 11 (S11). Next, the data encoding unit 5 generates a random signal (S12), and instructs the optical head unit 1 to start recording (S13). Next, the designated length is recorded at the position of the designated management information, and when the recording is completed, the optical head unit 1 is instructed to terminate the recording (S14, S15).

Finally, the operation of the management information erasure processing means 11 (management information erasure processing step) will be described.

The management information erasure processing means 11 makes the management information of the specified management division area unreadable. The target management division area is specified by an external computer through the interface unit 6. The position of the management information for performing the erasing process on the optical disk surface can be known from the management information obtained by the management information reading processing means 9. The length of the area where the management information exists is determined by the format of the optical disk and the format of the management information. By designating the position of the management information and instructing the dual recording processing unit 10 to record, the management information to be erased can be made unreadable. The same effect can be obtained by sending the management information to an external computer and configuring the management information erasure processing means 11 to receive designation of an area to be erased from the external computer. Also,
The same effect can be obtained by performing the double recording process not only on the area where the management information exists but also on the entire specified management section area.

Next, the operation of the management information erasure processing means 11 will be described with reference to the flowchart of FIG. First, a management section area to be deleted is obtained from the interface unit 6 (S21).

Next, the position of the next management information to be deleted is obtained from the previous management information (S22). Next, it instructs the double recording processing means 10 to record an undecodable signal at the position of the management information, that is, to record unreadable information (S23).

FIGS. 5A and 5B show the state of the optical disk before and after the restoration process is performed, wherein FIG. 5A shows the state before the restoration and FIG. 5B shows the state after the restoration. FIG. 5 schematically shows an optical disk that crosses from the center in the radial direction. FIG.
In the above, 20 is a management division area recorded normally, 21
Is a main data area of the management section area, 22 is an area of management information (position of management information) with respect to the normally recorded management section area, 23 is a defect management section area in which data is not normally recorded, and 23a is an erasing process. Management division area where the
4 is a main data area of the defect management section area, 25 is an area of management information for the defect management section area 23, and 26 is an area of management information double recorded by the restoration process.

By performing such a restoration process, the management information of the management division area 23a that has been subjected to the erasure process cannot be read. The management section area 23a that has been subjected to the erasure processing is equivalent to an area in which no management information is recorded, and the inconsistency of the management information is resolved. As a result, the optical disk device recognizes that the optical disk is of a normal format, and can read the data of the management division area (for example, the area 20) recorded normally.

As described above, according to the present embodiment, management information reading processing means 9 for reading management information for a plurality of management division areas of an optical disc and determining whether the read management information is normal, The dual recording processing means 10 for recording an unusable signal in a designated area, and the area for making the management information obtained by the management information reading processing means and the management information specified by an external erasure request unreadable. Is provided in the restoration processing means 8 and the management information erasing processing means 11 for instructing the double recording processing means to specify the position of the management information of the management division area which is not normally recorded, and By recording an undecodable signal in the management division area, it is possible to make the management division area in which the management information whose position is specified exists, equivalent to that in which the management information is not recorded. Can manage information of one management partition area is restored to the state readable write-once optical disc becomes unreadable also management information of other control classification area to not recorded correctly.

[0030]

As described above, according to the optical disk apparatus of the first aspect of the present invention, the disk surface of the optical disk is divided for management of data recording / reproduction, so that a write-once optical disk having a plurality of management division areas. An optical disc apparatus having a repair processing means for performing a repair on the optical disc, wherein the repair processing means reads management information for a plurality of management division areas of the optical disc and determines whether the read management information is normal or not. And a double recording processing means for recording an undecodable signal in a designated area, and making the management information obtained by the management information reading processing means and management information specified by an external erasure request unreadable. Management information erasure processing means for instructing the dual recording processing means by designating an area to By designating the position of the management information of the segmented area and recording an undecodable signal at that position, the management segmented area where the management information at the designated position exists is equivalent to that which is not recorded. Can be restored to a readable state for a write-once optical disc in which the management information of one management section is not normally recorded and the management information of another management section is also unreadable. An advantageous effect is obtained.

According to a second aspect of the present invention, there is provided an optical disk repair method for a write-once optical disk having a plurality of management division areas by dividing a surface of the optical disk for management of data recording and reproduction, A management information reading step of reading management information for a plurality of management division areas of the optical disc to determine whether the management information is normal; reading management information obtained in the management information reading step and management information specified by an external erasure request; By having a management information erasing step instructing an unreadable state and a double recording step of recording an undecodable signal at the position of the management information instructed to be unreadable, Specify the position of the management information of the management division area that is not recorded in, and write an undecodable signal at that position. By doing so, it is possible to make the management section area in which the management information whose position is specified exists, equivalent to that in which the management information is not recorded, so that the management information of one management section area is not recorded normally. An advantageous effect is obtained that the write-once optical disc in which the management information of the other management division areas also becomes unreadable can be restored to a readable state.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an optical disk device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the management information reading processing means of FIG. 1;

FIG. 3 is a flowchart showing the operation of the dual recording processing unit of FIG. 1;

FIG. 4 is a flowchart showing the operation of the management information erasure processing means of FIG. 1;

FIG. 5 is a diagram showing a state of an optical disk before and after performing a restoration process.

FIG. 6 is a plan view showing an optical disk having two management division areas.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical head part 2 Data decoding part 3 Position information detecting part 4 Optical head moving part 5 Data encoding part 6 Interface part 7 System control part 8 Restoration processing means 9 Management information reading processing means 10 Double recording processing means 11 Management information Erasure processing means 101 First management section area 102 Second management section area

Claims (2)

[Claims] 1. An optical disc apparatus comprising a restoration processing means for restoring a write-once optical disc having a plurality of management division areas by dividing a surface of an optical disc for management of data recording / reproduction. Is a management information reading processing means for reading management information for a plurality of management division areas of an optical disc and determining whether the read management information is normal, and a double recording process for recording an undecodable signal in a designated area. Means, and instructs the dual recording processing means by designating an area to make the management information obtained by the management information reading processing means and the management information specified by an external erasure request unreadable. An optical disc device comprising management information erasure processing means. 2. An optical disk repair method for a write-once optical disk having a plurality of management division areas by dividing a disk surface of the optical disk for management of data recording and reproduction, wherein management information for a plurality of management division areas of the optical disk is stored. A management information reading step of reading and determining whether or not the management information is normal; and a management instructing that the management information obtained by the management information reading step and the management information specified by an external erasure request become unreadable. An optical disk repair method, comprising: an information erasing step; and a dual recording step of recording an undecodable signal at a position of management information instructed to be in an unreadable state.