System for detecting a reference track on a disk surface in a di

Details System for detecting a reference track on a disk surface in a di System for detecting a reference track on a disk surface in a di

1987-10-09

1989-10-17

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7814, G11B 5596

Patent

active

048751146

ABSTRACT:
In a system for detecting a reference track on a disc for a disc storage unit, servo information for detecting an off-track amount of a position of a read/write head relative to the track is written on the disc surface. The servo information is formed by a repetition of simple patterns. A pattern of servo information for a reference track among those patterns is written at a frequency different from that for ordinary tracks. The write-in frequencies of the patterns for ordinary and reference tracks are discriminated from each other in accordance with the signals obtained by reading out the servo information written onto the tracks from the read/write head. When the write-in frequency for a reference track is discriminated, it is detected that the head is on the reference track. A reference track can be detected without having recourse to a particular sensor and a circuit attached thereto.

REFERENCES:
patent: 4048660 (1977-09-01), Dennison et al.
patent: 4086636 (1978-04-01), Cizmic et al.
patent: 4419701 (1983-12-01), Harrison et al.
patent: 4516177 (1985-05-01), Moon et al.
patent: 4683504 (1987-07-01), Cantello et al.

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