Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1991-06-26
1994-01-04
Sikes, William L.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 70, 360 722, 360 7303, 360 75, 360 7804, 360 7814, G11B 1546
Patent
active
052765695
ABSTRACT:
A data storage system having a number of disk drives is disclosed. Each disk drive is provided with a disk spindle driven by a spindle motor. The disk spindle is utilized for mounting one or more disks whose surface is used for data storage. A read/write head mounted on an actuator is provided for each disk surface. Each read/write head is positioned over a desired location on the disk surface by a control mechanism in order to transfer data to and from the disk surface. Data and position information are encoded on each disk surface according to a pre-specified format. The rotation of the disk spindle is controlled to maintain a desired angular position and velocity. A sensor signal indicative of the disk spindle angular position and velocity is obtained independently of the position information encoded on the disk surface. A reference signal, which is obtained from the disk surface, is combined with the sensor signal to adjust the angular position of the disk spindle.
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Cefalo Albert P.
Cunningham Terry P.
Digital Equipment Corporation
Hudgens Ronald C.
Sikes William L.
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