The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 09, 1997
Filed:
Aug. 29, 1994
Koji Horibe, Kasugai, JP;
Fujitsu Limited, Kawasaki, JP;
Fujitsu VSLI Limited, Kasugai, JP;
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.