Patent ID: 6075671
Filing Date: 2000-06-13
Classification: G11B

Abstract:
A method for unsticking a head/slider assembly stuck to the surface of the magnetic recording disk which is rotated by a drive motor, the head/slider assembly being attached to a support arm which is moveable across the recording disk by a voice coil motor, the method comprising steps of:(a) setting a frequency range defined by two frequencies between which exist a resonant frequency of the mechanical system containing the head/slider assembly, the support arm, the recording disk and the drive motor;(b) successively selecting different one of a plurality of frequencies in the frequency range as a frequency of alternate drive signals applied to the drive motor to oscillate the recording disk and the head/slider assembly;(c) detecting an amplitude of the counterelectromotive force induced in the voice coil motor in each successive frequency;(d) selecting a frequency at which the largest amplitude of the counterelectromotive force is generated; and(e) applying alternate drive signals at the frequency selected in step (d) to the drive motor or voice coil motor.