Patent ID: 6934116
Filing Date: 2005-08-23
Classification: G11B

Abstract:
1. A disk drive comprising: a head which reads/writes data at a target position on a disk medium; an actuator mechanism which has the head mounted thereon and moves the head to the target position; and a head positioning control system which performs head positioning control over the head to the target position, wherein the head positioning control system includes: a follow-up controller which executes a control operation with the actuator mechanism which moves the head being determined as a control target in accordance with a predetermined servo cycle, based on a position error between current position of the head and the target position; a disturbance detection unit which detects a disturbance applied from the outside; a feedforward controller which executes a feedforward control to suppress the influence of the disturbance during a control operation of the follow-up controller; and an identification unit which executes parameter identification processing to determine a transfer function of the feedforward controller, and wherein the head positioning control system is configured to perform simultaneously a control execution of the feedforward controller and the parameter identification processing in accordance with the servo cycle.