Method for sensing run-out in data fields

Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head

Reexamination Certificate

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C360S075000

Reexamination Certificate

active

06952321

ABSTRACT:
A method of determining run-out in a disc drive involving steps of performing a direct current erase, selecting a reference track, writing a sinusoidal signal into a first track at a first offset from the reference track, sensing a read signal along the reference track, and analyzing the read signal to extract run-out information.

REFERENCES:
patent: 5859742 (1999-01-01), Takaishi
patent: 5909661 (1999-06-01), Abramovitch et al.
patent: 5949602 (1999-09-01), Ishioka et al.
patent: 6606214 (2003-08-01), Liu et al.
patent: 6714367 (2004-03-01), Ishida et al.

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