Head positioning control device for a magnetic disk apparatus

Details Head positioning control device for a magnetic disk apparatus Head positioning control device for a magnetic disk apparatus

1994-05-23

1995-12-12

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7804, 360 7704, 360 7702, G11B 5596

Patent

active

054755441

ABSTRACT:
A head positioning control device for a magnetic disk apparatus has a head selection circuit for selecting one of a plurality of magnetic heads based on an external head address, a servo control circuit for controlling a movement of a selected magnetic head to a prescribed position through a head positioning motor. A head positioning control unit sets prescribed control information in the servo control circuit based on an external instruction. A head address switching device is connected to the head selection circuit for receiving a head switching signal set by an external instruction, the head address and a burst-area information, and sending a prescribed head address to the head selection circuit. A sector pulse generator sends a sector pulse corresponding to a zone in which the magnetic head is positioned to the head address switching means. The head address switching means has a latch which, when a burst-area information is input, switches and outputs a head address input during an inputting of the burst-area information after the burst-area information becomes inactive. A first delay circuit outputs a signal flag indicating an existence of a head switching signal with the same timing as that of the head address output by the latch circuit. A second delay circuit outputs a signal flag indicating a completion of head address switching after a next burst-area information is read.

REFERENCES:
patent: 4896228 (1990-01-01), Amakasu et al.
patent: 5053897 (1991-10-01), Ikeshita
patent: 5109502 (1992-04-01), Sasamoto et al.
patent: 5270885 (1993-12-01), Satoh et al.

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