Patent ID: 6943981
Filing Date: 2005-09-13
Classification: G11B

Abstract:
1. A method for improving servo-demodulation robustness, comprising: (a) after detection of the SAM pattern in a first servo wedge, determining at least one predicted servo demodulation value for a second servo wedge; (b) after detection of the SAM pattern in the second servo wedge, determining at least one actual servo demodulation value for the second servo wedge; (c) characterizing the detection of the SAM pattern in the second servo wedge as either a good SAM detection or a bad SAM detection, based on a comparison of the at least one predicted value to the at least one actual value; and (d) performing further servo functions based on whether the detection of the SAM pattern in the second servo wedge is characterized a good SAM detection or a bad SAM detection.