Disk drive employing a multiple-input sequence detector responsive to reliability metrics to improve a retry operation
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United States of America Patent
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Jun 11, 2002
Grant Date -
N/A
app pub date -
Sep 10, 1999
filing date -
Sep 10, 1999
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Abstract
A disk storage system is disclosed employing an improved retry operation. The disk drive comprises a disk for storing a data block, and a head for reading the data block to generate an analog read signal during an initial read operation. A sampler samples the analog read signal to generate a sequence of read signal sample values, and a multiple-input sequence detector detects an initial estimated data sequence from the read signal sample values during the initial read operation. A reliability metrics generator generates reliability metrics representing an estimated reliability for data in the initial estimated data sequence, and the reliability metrics are stored in a local memory. During a retry operation, a memory controller transfers the reliability metrics generated during the initial read operation to the multiple-input sequence detector which generates a retry estimated data sequence using the reliability metrics, whereby the reliability metrics improves the probability of accurately detecting the retry estimated data sequence.
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