Method of controlling the position of a read/write head and...

Details Method of controlling the position of a read/write head and... Method of controlling the position of a read/write head and...

2007-06-25

2010-11-16

Olson, Jason C (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S006000, C360S031000, C360S077030

Reexamination Certificate

active

07835106

ABSTRACT:
A method of controlling the position of a read/write head relative to a disk in a test apparatus is disclosed. The test apparatus has a positioner for positioning the head. The positioner has a sensor to measure the actual position achieved by the positioner. The method includes generating a sensor signal measuring the actual position achieved by the positioner; generating a position error signal of the head relative to the disk detected at the head; high pass filtering the head position error signal and low pass filtering the sensor signal so that there is substantially no overlap in frequency between them; and, deriving a low frequency head error signal from the head position error signal corresponding to any drift of the head.

REFERENCES:
patent: 5828514 (1998-10-01), Chliwnyj et al.
patent: 6023145 (2000-02-01), Karaaslan et al.
patent: 6219193 (2001-04-01), Janz
patent: 6538838 (2003-03-01), Sacks et al.
patent: 6600622 (2003-07-01), Smith
patent: 7012777 (2006-03-01), Hirano et al.
patent: 2001/0033452 (2001-10-01), Koganezawa et al.
patent: WO 01/31643 (2001-05-01), None

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