Apparatus and method for correcting for defective sectors in a r

Details Apparatus and method for correcting for defective sectors in a r Apparatus and method for correcting for defective sectors in a r

1994-08-29

1997-09-09

Neyzari, Ali

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 58, 369 54, G11B 1722

Patent

active

056663358

ABSTRACT:
Apparatus is provided that reads and writes data from and to an optical disk. The optical disk has a read-only memory area and writable memory area each including a plurality of sectors for storing data. The apparatus determines whether or not data read from one sector in the read-only memory area is in error. When the data is determined to be in error, the apparatus corrects the data in the sector using an error check and correction code. When the error in the data cannot be corrected by the ECC operation, the apparatus corrects the error and write the corrected data into a writable memory area by performing an exclusive OR operation on parity data previously stored on the optical disk and data in other sectors within the sector group having the data error.

REFERENCES:
patent: 5241531 (1993-08-01), Ohno et al.
patent: 5270877 (1993-12-01), Fukushima et al.

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