Patent ID: 6798603
Filing Date: 2004-09-28
Classification: G11B

Abstract:
A disk drive comprising:(a) a disk; (b) a spindle motor for rotating the disk; (c) an actuator arm; (d) a head coupled to the actuator arm; and (e) disk control circuitry for: latching the head into a parked position when the disk drive is powered down; during a start-up process, controlling the spindle motor to rotate the disk toward an operating speed; measuring a speed of the spindle motor; if the disk drive is in a first spin-up mode, comparing the speed of the spindle motor to a first target speed and unlatching the head relative to the first target speed; and if the disk drive is in a second spin-up mode, comparing the speed of the spindle motor to a second target speed and unlatching the head relative to the second target speed, wherein: the first target speed and second target speed are less than the operating speed, and the second target speed is greater than the first target speed.