Method to control flying height between a head and a disk...

Details Method to control flying height between a head and a disk... Method to control flying height between a head and a disk...

2006-03-07

2006-03-07

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S046000, C360S068000

Reexamination Certificate

active

07009800

ABSTRACT:
A method and apparatus to control changes in a flying height between a write head and a disk caused by a write current or an overshoot value of a write current are provided. The method comprises: changing a write current or an overshoot value of the write current in relation to a temperature; determining whether the head and the disk surface of a hard disk drive are in contact in relation to changes of the write current or the overshoot value of the write current; and setting the write current and the overshoot value of the write current as a threshold when the head and disk surface are in contact. Accordingly, the magnitude of a write current and the threshold of an overshoot value can be accurately set, and a write current equal to or less than the threshold can be provided when a write operation is performed, thereby providing a reliable write operation.

REFERENCES:
patent: 6064534 (2000-05-01), Simozato
patent: 6195219 (2001-02-01), Smith
patent: 6297921 (2001-10-01), Price et al.
patent: 2003/0002183 (2003-01-01), Fioravanti
patent: 2004/0100255 (2004-05-01), Brunnett et al.

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