Off-track correcting method of disk apparatus and a disk apparat

Details Off-track correcting method of disk apparatus and a disk apparat Off-track correcting method of disk apparatus and a disk apparat

1997-03-24

1999-07-20

Young, W. R.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7804, 360 7814, G11B 5596

Patent

active

059263377

ABSTRACT:
Disclosed is an off-track correcting method for a disk apparatus for measuring an off-track correction value by use of servo data on a data surface. The data surface on a disk medium is recorded with servo data for an off-track measurement. The data head seals a cylinder position recorded with the off-track measurement servo data. It is determined whether or not this cylinder position is a sensitivity abnormal position of the cylinder. The data head reads a first item of servo data after offset-moving the data head by a predetermined quantity on inner and outer sides of the disk medium, corresponding to detecting that the data head is located in the sensitivity abnormal position. An off-track correction value in the cylinder position is calculated from the plural pieces of first servo data read finally in a plurality of reading positions. This, even when enhancing a track density, the precise off-track correction value can be thereby measured.

REFERENCES:
patent: 4731680 (1988-03-01), Moriyama et al.
patent: 5426544 (1995-06-01), Narita et al.
patent: 5521773 (1996-05-01), Suzuki et al.
patent: 5526201 (1996-06-01), Takata et al.

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