Patent ID: 7006312
Filing Date: 2006-02-28
Classification: G11B

Abstract:
1. A method for improving servo-demodulation robustness, comprising: (a) searching for a SAM pattern in a first servo wedge; (b) if the SAM pattern is detected in the first servo wedge, characterizing the detection of the SAM pattern as either a good SAM detection or a bad SAM detection; and (c) if a detection of the SAM pattern in the first servo wedge is characterized as a good SAM detection, selecting at least one channel control value associated with the first servo wedge as, or to predict, a starting channel control value for use when reading a next servo wedge, otherwise, if a detection of the SAM pattern in the first servo wedge is characterized as a bad SAM detection, selecting at least one previously stored channel control value as, or to predict, a starting channel control value for use when reading the next servo wedge.