Data head offset detecting circuit in magnetic disk unit and mag

Details Data head offset detecting circuit in magnetic disk unit and mag Data head offset detecting circuit in magnetic disk unit and mag

1992-04-28

1994-06-14

Look, Edward K.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7705, 360 7708, G11B 5546

Patent

active

053215648

ABSTRACT:
A data head offset detecting circuit in a magnetic disk unit includes a first offset detector that detects an offset .beta. based on servo information on a data surface read by the data head, a second offset detector that detects an offset .gamma. based on servo information on the servo surface read by the servo head, and an offset calculator for calculating a real offset .alpha. resulting from the subtracting of the offset .gamma. from the offset .beta.. By using the above circuit, an offset for a correction of an offtrack is detected accurately even when the heads are vibrating.

REFERENCES:
patent: 5023733 (1991-06-01), Koga et al.
patent: 5109502 (1992-04-01), Sasamoto et al.
patent: 5208711 (1993-05-01), Kitamura et al.

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