Patent ID: 6345074
Filing Date: 2002-02-05
Classification: G11B,H04L

Abstract:
A sampled amplitude servo detector for detecting servo data recorded on a disc storage medium partitioned into a plurality of concentric data tracks and comprising embedded servo sectors for positioning a read head over the disc storage medium, wherein each servo sector comprises a track address and each track address comprises at least one valid codeword of a servo code, the servo detector comprising:(a) a sampling device for sampling an analog read signal emanating from the read head positioned over a servo sector to generate a sequence of read signal sample values; and (b) a discrete time sequence defector for detecting a codeword of a track address, comprising: (i) a metric generator for generating error metrics between a predetermined number of the read signal sample values and sample values of only valid codewords of the servo code; (ii) a comparator for comparing the error metrics according to a predetermined criteria; and (iii) a selector, responsive to the comparator, for selecting one of the codewords as the output of the sequence detector.