Patent ID: 8194344

Claim:
A system comprising: a read channel module configured to read, using a head of a disk drive, servo bursts from a servo region of a track of the disk drive, wherein the servo bursts include a first servo burst, a second servo burst, a third servo burst, and a fourth servo burst; a signal generating module configured to generate signals based on a position of the head relative to the servo bursts, wherein the signals indicate whether the head is aligned with the track; and a position module configured to generate a first difference based on the signals corresponding to the first servo burst and the second servo burst, generate a second difference based on the signals corresponding to (i) the third servo burst and (ii) the first servo burst or the second servo burst, wherein the second difference is independent of the fourth servo burst, and determine the position of the head relative to the track based on (i) the first difference and (ii) the second difference.