Clearance sweep test

Details Clearance sweep test Clearance sweep test

2007-11-27

2007-11-27

Tzeng, Fred F. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Reexamination Certificate

active

11525292

ABSTRACT:
A calibration method for a fly on demand head of a hard disk drive. The method includes the steps of flying a head over a test track of a disk that is covered with a lubricant. A voltage is applied to a heating element of the head to move the head closer to the disk. The fly height of the head is then determined. The voltage can be incrementally varied until the head makes contact with the disk. This sequence can cause a modulated wear pattern in the lubricant of the disk. The voltage is terminated and the head is allowed to fly over the test track. The head is also moved to adjacent tracks on either side of the test track. A pressure gradient of the flying head moves the lubricant about the disk to mitigate the modulated wear pattern.

REFERENCES:
patent: 6417981 (2002-07-01), Smith
patent: 6773784 (2004-08-01), Sonoda et al.
patent: 6914739 (2005-07-01), Feliss et al.
patent: 7124625 (2006-10-01), Kurita et al.

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