Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1990-05-30
1992-09-01
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 69, 360 75, 360105, G11B 555
Patent
active
051445042
ABSTRACT:
A disk drive unit includes a servo head, a plurality of data magnetic heads, magnetic disks for receiving and storing information through these heads, a drive circuit and a revolution detecting circuit for rotating the magnetic disks at a constant speed, a servo control circuit for positioning these heads in accordance with servo information read from the disk, and first and second delay circuits. The first delay circuit is turned ON for a predetermined time when the speed of rotation reaches a predetermined speed, and the second delay circuit is turned ON for another predetermined time when the first delay circuit is turned OFF. When the second delay circuit is turned ON, the servo head and the magnetic heads are withdrawn to a contact start stop area, and further, the magnetic heads and the servo head can carry out read and write operations, and when the second delay circuit is turned OFF, the heads are positioned at a cylinder, whereby the power consumption for withdrawing the heads can be reduced.
REFERENCES:
patent: 4782406 (1988-11-01), Shoji et al.
Fujitsu Limited
Garland Steven R.
Psitos Aristotelis
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