Error detection and correction in an optical storage system

Details Error detection and correction in an optical storage system Error detection and correction in an optical storage system

G - Physics

11

B

352/32.1

G11B 7/00 (2006.01) G11B 20/18 (2006.01) H03M 13/15 (2006.01)

Patent

CA 1235810

ABSTRACT OF THE DISCLOSURE A self-checking shared encoder/decoder circuit 161 for use with a Reed-Solomon coding scheme of an optical disk storage system. The optical disk system (20) includes a drive adapted to permanently store data on a removable platter (44). Prior to recording a data byte on the platter, the data is encoded with a Reed-Solomon code. When the data is read from the disk, it is decoded and error correction syndromes are generated with ECC generation circuits (164). A plurality of syndrome buffer registers are provided in order to allow several of the error correction functions to be carried out in parallel. Syndromes that are detected to comprise all zeros are used to simplify the error correction processes beyond the normal processes used. The same circuitry is shared for performing the encoding and decoding functions. This circuitry includes independent sets of a RAM (165), coupled to one input of an exclusive OR (modulo two sum) adding circuit (177). The output of the adding circuit is fed back to an input of the RAM (165). Two multiplier circuits are coupled to the output of the RAM (165). A product of one is tied to one input of the modulo two addition circuit (172). The product of the other is combined in another module two addition circuit (173) with similar products from other sets, and the resulting combination signal is selectively connected to the other input of the modulo two addition circuit (172), along with data to be recorded on the platter, or data read from the platter.

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