Patent ID: 6088187
Filing Date: 2000-07-11
Classification: G11B

Abstract:
A control system for a two-stage actuator for a magnetic disk drive having a base, comprising:a rotary coarse actuator having a voice coil motor as driving means rotatably mounted on said base;a microactuator mounted on said coarse actuator and carrying a head at a front end portion;first control means for controlling driving of said coarse actuator;second control means for controlling driving of said microactuator; andfeedback means for calculating a position error between a target position and an observed position of said head, and inputting said position error directly into said first and second control means;wherein displacement of said microactuator relative to said coarse actuator is not input into said first control means, andwherein a servo band of a coarse actuator control system is 1/3 or more of a servo band of said two-stage actuator control system.