Magnetic recording disk drive with actively controlled...

Details Magnetic recording disk drive with actively controlled... Magnetic recording disk drive with actively controlled...

2006-03-21

2006-03-21

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S031000, C360S025000

Reexamination Certificate

active

07016139

ABSTRACT:
An electrical potential difference between a slider body and a hard disk of a hard disk drive is eliminated based on the flying-height spacing of the slider body between the slider body and the hard disk. A predetermined bias voltage is applied between the slider body and the hard disk that includes a DC component and an AC component and that is based on the detected flying-height spacing of the slider body. The flying-height spacing can be detected based a minimum slider-to-disk clearance change from a design flying height of the slider at a frequency of the AC component as the DC component of the predetermined bias voltage is varied. Alternatively, the flying-height spacing can be detected based on a minimum electrodynamic response of the slider to a first harmonic of the AC frequency of the AC component as the DC component is varied.

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J.D. Kiely et al., “Tribocharging of the magnetic hard disk drive head-disk interface,” Journal of Applied Physics, vol. 91, No. 7, Apr. 1, 2002, pp. 4631-4636.

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