Patent ID: 6530060
Filing Date: 2003-03-04
Classification: G11B

Abstract:
A sampled amplitude read channel for reading a data sector recorded on a disk storage medium by detecting an estimated data sequence from a sequence of read signal sample values generated by sampling an analog read signal emanating from a read head positioned over the disk storage medium, the data sector comprising a user data segment and a known data segment, the sampled amplitude read channel comprising:(a) a sampling device for sampling the analog read signal to generate the read signal sample values; (b) a trellis sequence detector for detecting a preliminary sequence from the read signal sample values; and (c) a post processor for detecting and correcting errors in the preliminary sequence comprising: (i) a syndrome generator, responsive to the preliminary sequence representing the user data segment, for generating an error syndrome according to a predetermined error detection code; (ii) a boundary error compensator, responsive to the preliminary sequence, for compensating for a boundary error event spanning the user data segment and the known data segment; and (iii) a guided error corrector, responsive to the error syndrome, for correcting errors detected in the preliminary sequence.