Method and apparatus for positioning head on the basis of premea

Details Method and apparatus for positioning head on the basis of premea Method and apparatus for positioning head on the basis of premea

1989-11-30

1991-09-24

Wolff, John H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7708, 360 7804, G11B 5596

Patent

active

050518518

ABSTRACT:
The magnetic disk apparatus having improved tracking performance, includes a head for accessing a magnetic disk which is rotated, a displacement detector, a head position controller, a table and a controller. The displacement detector detects an amount of displacement of the head from a designated track of the magnetic disk, based on a signal through the head from servo data associated with the designated track and generating displacement data from the displacement amount. The head position controller controls a position of the head in a radial direction of the magnetic disk in response to an input position control instruction. The table stores a plurality of disk-dependent displacement data. The controller reads out disk-dependent displacement data from the table in accordance with the designated track and outputting the position control instruction to the head position controller in accordance with the displacement data from the displacement detector and the disk-dependent displacement data.

REFERENCES:
patent: 4827362 (1989-05-01), Baba
patent: 4964009 (1990-10-01), Moriya et al.
"Digital Magnetic Recording Technology", (Tiriceps Co., Ltd.), Jan. 29, 1986.

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