Margining decoding utilizing soft-inputs

摘要

Determining a parameter associated with whether a portion of a storage device is defective is disclosed. Determining comprises: obtaining known data associated with the portion; reading back from the portion to produce a read-back waveform; decoding the read-back waveform, including producing statistical information; and determining a parameter associated with whether the portion is defective based at least in part on the statistical information.

主权项

1. A method for processing a portion of a storage device, comprising:
obtaining known data associated with the portion; reading back from the portion to produce a read-back waveform; using a detector to decode the read-back waveform, including by producing statistical information which includes (1) a set of one or more estimated values associated with the portion and (2) a set of one or more reliabilities, wherein each reliability in the set of reliabilities indicates a reliability with which a corresponding estimated value in the set of estimated values is generated; determining which of the set of estimated values are incorrect based at least in part on the set of estimated values and the known data; and counting the number of incorrect estimated values which have a corresponding reliability which is greater than a reliability threshold, including by:
determining a number of incorrect log-likelihood ratios (LLRs) that have a magnitude greater than a first threshold; andcomparing the number of incorrect LLRs that have a magnitude greater than the first threshold against a second threshold.