Data recovery after error correction failure

Details Data recovery after error correction failure Data recovery after error correction failure

1992-03-13

1994-06-14

Canney, Vincent P.

Excavating

371 381, H04L 108

Patent

active

053217039

ABSTRACT:
A method of data recovery in systems employing error-correction coding techniques is described. The technique may be used, for example, in conjunction with a data storage device or a data communications network. Several trials of accessing or transmitting the ECC-protected data are performed. The data from each trial is decoded, and is also saved. If none of the trials results in the successful decoding of the data, then a reconstruction function is employed to create a reconstructed version of the data from the sequence of data created by the trials. One method of reconstruction involves majority voting on a symbol-by-symbol basis. The reconstructed data created that way is then decoded in the same fashion as for each trial. A more powerful reconstruction function employs a threshold to determine whether each voted-on symbol is sufficiently "reliable". If not, it is marked as an erasure. The reconstructed data created by this reconstruction function is decoded according to an error-and-erasure algorithm, which increases the error-correcting power of the ECC.

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Patent Abstracts of Japan, vol. 15, No. 102 (E-1043) Mar. 12, 1991 & JP,A,23 09 821 (Fujitsu Limited)25.

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