Ryan, Mason & Lewis, LLP
Methods and apparatus for selective data retention decoding in a hard disk drive
Methods and apparatus are provided for improved physical re-read operations in a hard disk drive. The disclosed methods and apparatus selectively retain data in a hard disk drive. A signal is read in an iterative read channel by assigning a reliability metric to each of a plurality of segments in a read signal; repeating the assigning step for a plurality of read operations; and selectively retaining the segments based on the assigned reliability metric. The read signal can be obtained by positioning a transducer over a storage media. The reliability metric may be based on soft bit decisions; log likelihood ratios or a noise estimation of a given segment.
LSI Corporation
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G11B H03M G11B H03M H03M G11B H03M
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Yuan Xing Jingfeng Shaohua Hongwei
Lee Liu Yang Song