Retrial and reread methods and apparatus for recording channels

Details Retrial and reread methods and apparatus for recording channels Retrial and reread methods and apparatus for recording channels

2004-06-30

2010-02-16

Chaudry, M. Mujtaba K (Department: 2112)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S055000, C714S814000

Reexamination Certificate

active

07665007

ABSTRACT:
A method of reading a data block from a sector of a recording media is described. The data block from the sector of the recording channel is decoded with an ECC decoder (first trial). The data block is re-decoded (second trial) using an adjusted timing recovery block that is adjusted based on the decoded data block, if the number of errors exceeded an error correction capability of the ECC decoder on the first trial. In one embodiment, the data block is reread from the same sector of the recording channel using the adjusted timing recovery block that is adjusted based on the re-decoded data block. The data block is subsequently jointly decoded with the waveforms obtained from the second trial by a possibly modified sequence detector, if the number of errors exceeded the error correction capability of the ECC decoder during the second trial.

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