Patent ID: 6466391
Filing Date: 2002-10-15
Classification: G11B

Abstract:
A head retraction circuit for supplying current to a voice coil motor (VCM) to retract a head into a safety zone of a disc, comprising:a switching unit adapted to receive a retraction signal and to produce a first control signal in response to the retraction signal; a first driver coupled to the VCM and the switching unit and adapted to provide current to the VCM in response to the first control signal; a holding unit coupled to the switching unit and adapted to receive the first control signal and to subsequently produce a second control signal after a predetermined time interval; and a second driver coupled to the VCM, the holding unit, and the switching unit and adapted to provide current to the VCM in response to the second control signal, wherein the first and second drivers are adapted to provide current to the VCM to retract the head into the safety zone after momentum in the VCM has substantially dissipated.