Patent ID: 6687080
Filing Date: 2004-02-03
Classification: G11B

Abstract:
A method for improved position error signal (PES) demodulation in the presence of baseline wander in a hard disk drive comprising the steps of:obtaining a plurality of samples within each period J of a burst signal for each servo burst in a servo sequence; computing and storing a difference value between a largest sample value and a smallest sample value of said plurality of samples within each said period J of said burst signal; said difference value represented by D(J); summing said difference values D(J) for each said period of said burst signal for each said servo burst in said servo sequence to produce peak to peak burst sum values Si represented by: S&it;â€ƒ&it;i=&Sum;J=1P&it;D&it;(J),i=a,b,c,dwhere P represents an integral number of said periods J within each said servo burst in said servo sequence and A, B, C, D are sequential servo bursts;using said peak to peak burst sum values Si to identify the position error signal (PES).