Reconstruction of syndromes for bi-level on-the-fly error correc

Details Reconstruction of syndromes for bi-level on-the-fly error correc Reconstruction of syndromes for bi-level on-the-fly error correc

1996-10-15

1998-05-19

Baker, Stephen M.

Excavating

371 381, G11B 2018

Patent

active

057545650

ABSTRACT:
A method and apparatus for reconstructing syndromes in a disk drive system. In the present invention, two levels of handling data errors are provided. The first attempt at correcting errors is performed by a dedicated error correction hardware. The error correction is based on a syndrome which was generated as a function of the data and ECC bits. An ECC code is selected such that the resulting syndromes produces a repeating, cyclical pattern. If the hardware correction circuit is unable to correct the error, the original syndrome value is reconstructed by processing the syndrome a number of times to where its current value in the next cycle corresponds to the original value in a previous cycle. This reconstructed syndrome is then used by the processor to handle the persisting error under firmware control.

REFERENCES:
patent: 4782490 (1988-11-01), Tenengolts
patent: 4916702 (1990-04-01), Berlekamp
patent: 5280488 (1994-01-01), Glover et al.

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