Magnetic disk unit having a plurality of magnetic heads

Details Magnetic disk unit having a plurality of magnetic heads Magnetic disk unit having a plurality of magnetic heads

1993-02-25

1995-07-11

Young, W. R.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7704, 360 69, 360 64, G11B 5596, G11B 1514

Patent

active

054326591

ABSTRACT:
In a magnetic disk unit, a magnetic head to be activated is switched from a first magnetic head to a second magnetic head in accordance with an instruction supplied from a host system in a state where a plurality of magnetic heads are positioned at a cylinder on magnetic disks. The magnetic disk unit includes a digital servo controller for monitoring at predetermined intervals whether or not the instruction for the changing of the magnetic head is supplied from the host system, a first output circuit for outputting a first signal for a predetermined time from a time at which the digital servo controller recognizes that the instruction for the changing of the magnetic head is supplied from the host system, and a second output circuit for outputting a second signal at least from a time at which the instruction for the changing of the magnetic head is input to the magnetic disk unit to a time at which the digital servo controller recognizes that the instruction is supplied from the host system. The first signal and the second signal indicate that the magnetic disk unit is busy adjusting the plurality of magnetic heads so that an off-track error of the second magnetic head is cancelled.

REFERENCES:
patent: 4525756 (1985-06-01), Takai et al.

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