Detection of fly height change in a disk drive using head drag

Details Detection of fly height change in a disk drive using head drag Detection of fly height change in a disk drive using head drag

2006-08-22

2006-08-22

Wong, Kim (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S073030

Reexamination Certificate

active

07095578

ABSTRACT:
A method for detecting a change in fly-height comprises measuring motor currents at various radii at a regular interval to determine the head drag. If any of the head drags at the various radii are greater than a threshold value, it is determined that a decrease in fly-height has occurred. If the disk drive has a head cleaner, a head cleaning is initiated to correct the fly-height change. If no head cleaning is necessary, a general error signal may be generated to indicate potential drive failure.

REFERENCES:
patent: 5309301 (1994-05-01), Gregory et al.
patent: 5412519 (1995-05-01), Buettner et al.
patent: 5850321 (1998-12-01), McNeil et al.
patent: 6587301 (2003-07-01), Smith

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