Patent ID: 7372659

Claim:
A head position control method for controlling a position of a head in a predetermined position of a disk storage medium by an actuator, comprising: a step of computing a position error from a target position of the head and a current position acquired from the head; a step of computing a control value of the actuator according to the position error; a step of computing an eccentricity correction value of an eccentricity frequency of the disk storage medium according to the position error; a step of computing a disturbance suppression value of a desired disturbance frequency according to the position error; a step of computing a drive value of the actuator from the control value, the eccentricity correction value and the disturbance suppression value; a step of detecting whether the disturbance frequency and a plurality of the eccentricity frequencies interfere with each other; and an interference prevention step of turning OFF the computation of the eccentricity correction value for the eccentricity frequency, which interferes, according to the position error, or shifting the desired disturbance frequency, when the interference is detected.