Method of measuring the read-to-write offset in a disc drive hav

Details Method of measuring the read-to-write offset in a disc drive hav Method of measuring the read-to-write offset in a disc drive hav

1994-02-07

2000-05-09

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 76, G11B 5596

Patent

active

060612010

ABSTRACT:
A method of measuring the read-to-write offset of a track in a disc drive system having separate read and write elements measures the amplitude of a test signal across the width if a track. A test pattern is written to the track at a predetermined actuator offset, which will typically be zero. Next, the read element is incrementally moved across the width of the track to measure a maximum amplitude in the read signal from the read element. After the maximum amplitude has been determined, the read element is incrementally moved across the width of the track to find first and second actuator offset positions where the read signal has an amplitude approximately equal to a predetermined percentage of the maximum amplitude. A midpoint is calculated between the first and second actuator offset positions, and the read-to-write offset is equal to the difference between the midpoint and the predetermined actuator offset.

REFERENCES:
patent: 4485418 (1984-11-01), Bremmer
patent: 4620244 (1986-10-01), Krause
patent: 4644421 (1987-02-01), Miwa et al.
patent: 4816938 (1989-03-01), Cowen et al.
patent: 4969059 (1990-11-01), Volz et al.
patent: 5001579 (1991-03-01), Compton
patent: 5185681 (1993-02-01), Volz et al.
patent: 5233487 (1993-08-01), Christensen et al.

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