Patent ID: 7706099

Claim:
A method of controlling a magnetic disk drive comprising a magnetic disk, a magnetic head, a support mechanism that supports the magnetic head on the magnetic disk and is rotatable about a rotation axis fixed outside the magnetic disk, a head actuator that rotatably drives the support mechanism to move the magnetic head in an approximately radial direction of the magnetic disk, and a rotational vibration detector that detects rotational vibration of a drive housing about the rotation axis, wherein an output signal from the rotational vibration detector is used for controlling the head actuator, wherein the method comprises: a head moving step of driving the head actuator to move the magnetic head on the magnetic disk, a frequency estimation step of estimating a frequency of each disturbance component contained in the output signal from the rotational vibration detector after moving the magnetic head, a convergence determination step of determining the convergence of the estimated frequency, and a suppressor setting step of setting a disturbance suppressor for suppressing the disturbance component based on the estimated frequency.