Multi-stage actuator disk drives, methods, and computer...

Details Multi-stage actuator disk drives, methods, and computer... Multi-stage actuator disk drives, methods, and computer...

2006-10-24

2006-10-24

Young, Wayne (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S077020

Reexamination Certificate

active

07126785

ABSTRACT:
Disk drives, methods, and computer program products are provided for controlling seeking of a transducer that is adjacent to a rotatable data storage disk in a disk drive. The disk drive includes a secondary actuator for positioning the transducer over a second range of movement, and a primary actuator for positioning the secondary actuator over a first range of movement that is larger than the second range of movement. The secondary actuator is controlled to move the transducer toward a target track on the disk while seeking. The primary actuator is controlled to move the secondary actuator toward the target track while simultaneously controlling the secondary actuator to maintain the transducer on the target track.

REFERENCES:
patent: 6707633 (2004-03-01), Okuyama et al.
patent: 6833974 (2004-12-01), Koso et al.
Singer et al.;An Efficient Algorithm for the Generation of Multiple-Mode Input Shaping Sequences, IEEE International Conference on Control Applications, Sep. 15-18, 1996, pp. 373-378.
Yamaguchi et al.;Improvement of Settling Response of Disk Drive Head Positioning Servo Using Mode Switching Control with Initial Value Compensation, IEEE Transactions on Magnetics, May 1996, vol. 32, No. 3, pp. 1767-1772.
Kobayashi et al.;Track Seek Control for Hard Disk Dual-Stage Servo Systems, IEEE Transactions on Magnetics, Mar. 2001, vol. 37, No. 2, pp. 949-954.
Mizoshita et al.;Vibration Minimized Access Control for Disk Drives, IEEE Transactions on Magnetics, May 1996, vol. 32, No. 3, pp. 1793-1798.
Tomizuka;Zero Phase Error Tracking Algorithm for Digital Control, Journal of Dynamic Systems, Measurement, and Control; Mar. 1987, vol. 109, pp. 65-68.

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