Disk drive unit, controller for actuator, and method for...

Details Disk drive unit, controller for actuator, and method for... Disk drive unit, controller for actuator, and method for...

2005-08-16

2005-08-16

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S078080

Reexamination Certificate

active

06930849

ABSTRACT:
In a hard disk drive where data is read from and written to a magnetic disk by a magnetic head in accordance with a command from a host computer, a moving distance of the magnetic head in a radial direction is detected within a predetermined period of time. The magnetic head is moved for seeking by a predetermined distance when the moving distance detected is small. The system and method of the present invention reduces write failures due to the undulation of a lubricant film on the magnetic disk by effectively preventing undulation.

REFERENCES:
patent: 4882671 (1989-11-01), Graham et al.
patent: 5200867 (1993-04-01), Albrecht et al.
patent: 5941998 (1999-08-01), Tillson
patent: 5963392 (1999-10-01), Sri-Jayantha et al.
patent: 6687077 (2004-02-01), French et al.

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