Dual-stage actuator disk drive with secondary actuator...

Details Dual-stage actuator disk drive with secondary actuator... Dual-stage actuator disk drive with secondary actuator...

2006-07-04

2006-07-04

Nguyen, Hoa T. (Department: 2627)

Dynamic magnetic information storage or retrieval

General recording or reproducing

Reexamination Certificate

active

07072134

ABSTRACT:
A dual-stage actuator disk drive uses a secondary-actuator failure-detection and calibration test run by the servo control processor and a relative-position sensor for measuring the position of the secondary actuator relative to its neutral position in response to the calibration test. The secondary-actuator failure detection and calibration test can be performed on a regular schedule or at selected times, such as at disk drive start-up. With the primary actuator biased at a test location, such as a crash stop or a load/unload ramp, the servo control processor generates a test signal to the secondary actuator and receives a relative-position signal (RPS) from the relative-position sensor in response to the test signal. The test comprises two measurements: a measurement of the secondary actuator static characteristics, and a measurement of the secondary actuator dynamic characteristics.

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