Marking unreliable symbols in a hard disk drive read back...

Details Marking unreliable symbols in a hard disk drive read back... Marking unreliable symbols in a hard disk drive read back...

2009-02-03

2010-11-02

Chase, Shelly A (Department: 2112)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Error/fault detection technique

Reexamination Certificate

active

07827474

ABSTRACT:
A system for detecting errors in a channel includes a signal detector to detect a first sequence from the channel, the first sequence comprising a plurality of symbols. A decoder determines a total number of symbols in error in the first sequence. A decoder asserts a failure indication when the total number of symbols in error in the first sequence is greater than a predetermined threshold. A controller causes the signal detector to detect a second sequence from the channel in response to the decoder asserting the failure indication. The decoder identifies corresponding symbols in the first sequence and the second detected sequence that differ.

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