System and method for detecting head instability

Details System and method for detecting head instability System and method for detecting head instability

2006-09-26

2006-09-26

Young, Wayne (Department: 2627)

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

C360S025000, C360S046000

Reexamination Certificate

active

07113355

ABSTRACT:
Embodiments of the present invention relate to systems, methods, and computer readable media for calibrating storage devices such as hard drives. A testing system is connected to a group of storage devices that are being prepared for release and eventual sale. Alternately, a storage device may be connected to an end-user system for which it is in use. The storage devices are tested for head instability. A lower frequency test pattern is performed, which induces a stronger magnetic field. A measurement of servo gain control is taken while reading from a disk and compared to a baseline for servo gain control. If the variance is larger than a predetermined amount, then the read/write head is determined to be unstable.

REFERENCES:
patent: 6373647 (2002-04-01), Baker
patent: 6433540 (2002-08-01), Hachisuka et al.
patent: 6943545 (2005-09-01), Patland et al.

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