Patent ID: 6411056
Filing Date: 2002-06-25
Classification: G11B

Abstract:
A system for stabilizing rotation control of a disk drive, wherein said disk drive includes a spindle motor that rotates a disk at a predetermined speed in accordance with a spindle current, said system comprising:a head for reading or writing data stored on said disk; a head load mechanism for driving said head by an actuator equipped with a voice coil motor, wherein said head load mechanism loads or unloads said head to or from said disk; a load detector for detecting a change in load on said spindle motor; and a slew rate controller for adjusting a slew rate of said spindle current in response to said load detector detecting an abrupt change in load on said spindle motor, wherein said slew rate controller further comprises: means for detecting a head load command; and means for adjusting a slew rate of said spindle current in response to detecting said head load command.