Patent ID: 7265934
Filing Date: 2007-09-04
Classification: G11B

Abstract:
1. A head positioning control method for controlling positioning of a head onto a desired track of a disk by an actuator according to a position signal which the head has read from the disk, comprising the steps of: calculating a control value of the actuator according to a position error between a target position and a current position acquired from said position signal; estimating sequentially external vibration frequency from a signal that is based on the position error according to an adaptive rule; estimating a rotation vector of cyclic disturbance from the signal that is based on the position error and calculating an external vibration suppression control value using a constant for external vibration suppression, sequentially correcting said constant for external vibration suppression according to each of the sequentially estimated external vibration frequencies; and generating a drive value of the actuator by adding the control value and the external vibration suppression control value.