Method and apparatus for checking read errors with two...

Details Method and apparatus for checking read errors with two... Method and apparatus for checking read errors with two...

2005-03-15

2005-03-15

Dildine, R. Stephen (Department: 2133)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S763000, C714S765000, C714S769000, C714S781000

Reexamination Certificate

active

06868517

ABSTRACT:
Method and apparatus for detecting errors in data read from a data storage medium include an error correction step/device which receives at least one of (i) data and (ii) data with errors, from the data storage medium, and outputs an error sequence in a first order in the case where data with errors is received. A first CRC step/device receives the at least one of (i) data and (ii) data with errors from the data storage medium, and outputs a CRC checksum in a second order different from said first order. A second CRC step/device receives both the error sequence and the CRC checksum, and outputs another CRC checksum indicative of whether the correction device or step has generated a correct error sequence. Preferably, a first CRC is coupled parallel to a Reed-Soloman decoder, and a second CRC is coupled in series with the first CRC and so as to receive the output of the R-S decoder. The second CRC will thus be able to detect errors in the output of the R-S decoder, and provide an error signal which will cause the erroneous data to be reread.

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