Determining contact write current in disk drive using...

Details Determining contact write current in disk drive using... Determining contact write current in disk drive using...

2007-05-29

2007-05-29

Tzeng, Fred F. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

Reexamination Certificate

active

10338046

ABSTRACT:
In a disk drive, a contact write current that causes head-disk contact due to pole tip protrusion is detected using a variance of a position error signal (PES). A method of determining the contact write current includes generating PES's in response to the head reading servo sectors on the disk, calculating PES variances wherein each PES variance is a statistical measure of a different group of the PES's, calculating a change in the PES variances, and selecting the contact write current in response to the change in the PES variances.

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