Optical recording system with error correction and data recording distributed across multiple disk drives

• US 5,185,746 A
• Filed: 04/13/1990
• Issued: 02/09/1993
• Est. Priority Date: 04/14/1989
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Kiyose, Yoshihiro, Ito, Osamu, Ozaki, Minoru, Tanaka, Kunimaro
• Primary Examiner(s): Beausoliel, Robert W.
• Assistant Examiner(s): HUA, LY
• Application Number:
  US07/509,635
• Time in Patent Office: 1,033 Days
• Field of Search: 371/40.1, 371/40.2, 371/40.3, 371/40.4, 371/21.1, 371/21.6, 369/54, 360/22, 360/61, 360/47, 360/53
• US Class Current: 714/770
• CPC Class Codes: G06F 11/1008 in individual solid state devices G06F11/1004 takes precedence
• CPC Class Codes: G06F 11/1076 Parity data used in redundant arrays of independent storages, e.g. in RAID systems
• CPC Class Codes: G06F 11/2205 using arrangements specific to the hardware being tested
• CPC Class Codes: G11B 17/228 Control systems for magazines G11B17/225 takes precedence
• CPC Class Codes: G11B 20/1833 by adding special lists or symbols to the coded information G11B20/1806, G11B20/1866 take precedence

Abstract

An optical recording system which separates and records data on optical disks loaded respectively in a plurality of optical disk drives, check symbol of the data to be recorded being recorded on predetermined disks. Information about bad recording or lost data, which caused by the trouble of the optical disk drive, is memorized, and data to be recorded is reproduced by normally recorded and reproduced data, said check symbol and said information.

Claims

1. An optical recording system comprising:

a plurality of optical disk drives, each for being loaded with an optical disk;

a control apparatus, coupled to said plurality of disk drives, for controlling recording of information on and reproducing information from the optical disks, said control apparatus including;

means for separating data to be recorded into a plurality of data segments and recording each data segment on a separate optical disk;

means for generating a check symbol of an error correction code for the data to be recorded;

means for recording said check symbol on at least one optical disk that differs from the optical disks upon which the data segments are recorded;

means for detecting trouble with the plurality of optical disk drives and for identifying the disk drives that are the source of the trouble; and

means for storing accessing information about data that was to be recorded to the disk drives identified as the source of trouble, said accessing information being stored within either of said control apparatus and the disk drives not identified as having trouble.

2. An optical recording system as set forth in claim 1, wherein said error correction code is the Reed-Solomon code.

3. An optical recording system as set forth in claim 1, wherein said check symbol has a Hamming distance n of at least 3 and the check symbol is recorded on a number of optical disks equal to n-1.

4. An optical recording system as set forth in claim 3, wherein n=3.

5. An optical recording system as set forth in claim 3, wherein n=5.

6. An optical recording system as set forth in claim 1, wherein said accessing information includes the sector addresses of the data to be recorded to the optical disk drives with trouble.

7. An optical recording system as set forth in claim 1, wherein said accessing information includes the track addresses of the data to be recorded to the optical disk drives with trouble.

8. An optical recording system as set forth in claim 1, wherein said information is recorded on an optical disk.

9. An optical recording system as set forth in claim 1, wherein said information is stored in said control apparatus.

10. An optical recording system comprising:

a plurality of optical disk drives, each for being loaded with an optical disk;

a control apparatus, coupled to said plurality of disk drives, for controlling recording of information on and reproducing information from the optical disks, said control apparatus including;

means for separating data to be recorded into a plurality of data segments and recording each data segment on a separate optical disk;

means for generating a check symbol of an error correction code for the data to be recorded;

means for recording said check symbol on at least one optical disk that differs from the optical disks upon which the data segments are recorded;

means for detecting trouble with the plurality of optical disk drives and for identifying the disk drives that are the source of the trouble;

means for storing accessing information about data that was to be recorded to the disk drives identified as the source of trouble, said accessing information being stored within either of said control apparatus and the disk drives not identified as having trouble;

means for correcting errors in data recovered from optical disks loaded in the optical disk drives identified as the source of the trouble by utilizing said check symbol.

11. An optical recording system as set forth in claim 10, wherein said error correction code is the Reed-Solomon code.

12. An optical recording system as set forth in claim 10, wherein said check symbol has a Hamming distance n of at least 3 and the check symbol is recorded on a number of optical disks equal to n-1.

13. An optical recording system as set forth in claim 12, wherein n=3.

14. An optical recording system as set forth in claim 12, wherein n=5.

15. An optical recording system as set forth in claim 10, wherein said accessing information includes the sector addresses of the data to be recorded to the optical disk drives with trouble.

16. An optical recording system as set forth in claim 10, wherein said accessing information includes the track addresses of the data to be recorded to the optical disk drives with trouble.

17. An optical recording system as set forth in claim 10, wherein said means for storing accessing information includes means for setting a point responsive to the track addresses of the data to be written to the disk drives with trouble.

18. An optical recording system as set forth in claim 10, wherein said information is recorded on an optical disk.

19. An optical recording system as set forth in claim 10, wherein said information is stored in said control apparatus.

20. A method of recording data to and recovering data from a plurality of optical disks loaded within a corresponding plurality of disk drives, the method comprising the steps of:

separating data to be recorded into a plurality of data segments;

generating a check symbol of an error correction code for the data to be recorded;

recording each data segment on a separate optical disk;

recording said check symbol on at least one optical disk that differs from the optical disks upon which the data segments are recorded;

detecting trouble with the plurality of optical disk drives;

identifying the disk drives that are the source of the trouble; and

storing accessing information about data that was to be recorded to the disk drives identified as the source of trouble, said accessing information being stored within either of said control apparatus and the disk drives not identified as having trouble.

21. A method of recording data to and recovering data from a plurality of optical disks loaded within a corresponding plurality of disk drives as recited in claim 20 wherein the step of generating a check symbol of an error correction code includes generating a check symbol for the Reed-Solomon code.

22. A method of recording data to and recovering data from a plurality of optical disks loaded within a corresponding plurality of disk drives as recited in claim 20 wherein:

the step of generating a check symbol of an error correction code includes generating a check symbol with a Hamming distance n of at least 3; and

the step of recording said check symbol includes recording said check symbol on a number of optical disks equal to n-1.

23. A method of recording data to and recovering data from a plurality of optical disks loaded within a corresponding plurality of disk drives as recited in claim 20 wherein the step of storing accessing information includes storing the sector addresses of the data to be recorded to the optical disk drives with trouble.

24. A method of recording data to and recovering data from a plurality of optical disks loaded within a corresponding plurality of disk drives as recited in claim 20 wherein the step of storing accessing information includes storing the track addresses of the data to be recorded to the optical disk drives with trouble.

25. A method of recording data to and recovering data from a plurality of optical disks loaded within a corresponding plurality of disk drives as recited in claim 20 wherein the step of storing accessing information includes setting a pointer responsive to the track addresses of the data to be recorded to the optical disk drives with trouble.

26. A method of recording data to and recovering data from a plurality of optical disks loaded within a corresponding plurality of disk drives as recited in claim 20 wherein the step of storing accessing information includes storing the accessing information to a disk drive not identified as having trouble.

27. A method of recording data to and recovering data from a plurality of optical disks loaded within a corresponding plurality of disk drives as recited in claim 21 wherein the step of storing accessing information includes storing the accessing information to a control apparatus.

28. A method of recording data to and recovering data from a plurality of optical disks loaded within a corresponding plurality of disk drives as recited in claim 20 further comprising the steps of:

recovering data recorded on the plurality of optical disks; and

correcting errors in data that was to be recorded to the disk drives identified as having trouble by utilizing said check symbol.