I-003

Dual-stage Actuator Servo Control for High Density Disk Drives

Authors: Lin Guo, Douglas Martin and Don Brunnett
Affiliation: Advanced Technology Group, Maxtor Corporation, 510 Cottonwood Drive, Milpitas, CA 95035

Abstract
Three servo loop designs for disk drive dual-stage actuator systems are studied. The characteristics and benefits of each design are discussed. A parallel loop structure has been designed for a dual loop system with suspension based piezoceramic micro-actuators. Simulations in both frequency and time domains show dramatic performance improvements of the dual-actuator system over the conventional single loop servo system. The design was also implemented on a floating point DSP based experimental setup to show significant reduction of head motion achieved by using the dual-loop servo.

Lin Guo
Lin_Guo@maxtor.com