Positioning device for the access arm of the magnetic head of a

Details Positioning device for the access arm of the magnetic head of a Positioning device for the access arm of the magnetic head of a

1976-09-10

1978-05-02

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

318653, 360 77, 360 97, 360135, G11B 2108, G11B 2110, G11B 556

Patent

active

040878430

ABSTRACT:
The surface of a magnetic disk (23) is divided into servo sectors (S.sub.1) and data sectors (S.sub.2). A selectively positionable magnetic head (24) effects, in predetermined time intervals controlled by clock signals of a clock sensor (26), the transfer of servo and data signals. The servo signals sensed in the servo sectors are used for the track following control of the magnetic head.
The servo markings (Ma) recorded in the servo sectors (S.sub.1) are arranged, with twice the width (2d) of the data tracks in radial distances of one respective track width (d), one beside the other in a row along a disk radius. In each servo sector at least three rows (A, B, C) of servo markings (Ma) are provided. The servo markings are arranged in track direction one behind the other in such a manner that between each of the rows (A, B, C) a distance (g) is formed, and that each servo marking of one row overlaps a servo marking of the following row by one track width (d).

REFERENCES:
patent: 3034111 (1962-05-01), Hoagland et al.
patent: 3534344 (1970-10-01), Santana
patent: 3812533 (1974-05-01), Kimura et al.
patent: 3924268 (1975-12-01), McIntosh et al.
patent: 3994016 (1976-11-01), Moghadam
patent: 4027338 (1977-05-01), Kril

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