Patent ID: 6798592
Filing Date: 2004-09-28
Classification: G11B

Abstract:
A method for reducing position error signal in a disk drive comprising a recording head, a rotary actuator, a spindle motor, and a storage medium mounted on the spindle motor, the storage medium comprising an inner circumference, an outer circumference, and a magnetic-storage portion between the inner circumference and the outer circumference, the magnetic-storage portion having a radial width, the magnetic-storage portion comprising a first radial band proximate the outer circumference comprising about one-third of the radial width, a second radial band proximate the inner circumference comprising about one-third the radial width, and a third radial band between the first radial band and the second radial band comprising about one-third the radial width, the method comprising:(a) writing a first plurality of servo tracks to the storage medium in the first radial band at a first average servo track density; (b) writing a second plurality of servo tracks to-the storage medium in the second radial band at a second average servo track density; and (c) writing a third plurality of servo tracks to the storage medium in the third radial band at a third average servo track density, the first average servo track density being no greater than the second average servo track density, and the first average servo track density being no greater than the third average servo track density.