Patent ID: 6529460
Filing Date: 2003-03-04
Classification: G11B

Abstract:
A method of digitally processing asynchronously sampled analog data in a disk drive, comprising the steps of:averaging two adjacent samples taken from an analog data signal; estimating a peak amplitude of the data signal based on the average of the two adjacent samples; subtracting a measured base line value from the estimated peak amplitude to obtain a new estimated peak amplitude; using position error pattern signals obtained from a disk in the disk drive to generate a position error signal difference A-B and a maximum peak amplitude signal difference C-D, wherein A, B, C, and D are stored data points representing peak amplitudes from Servo Timing Mark Detector pulses; and dividing the A-B signal by the C-D signal to generate a normalized position error signal (A-B)/(C-D) to compensate for systematic changes in the data signal.