Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1993-04-23
1995-09-05
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 7302, 360 71, G11B 1546, G11B 1518
Patent
active
054484286
ABSTRACT:
A disk drive in a multi-disk storage system has a spindle synchronizer and a spindle controller that are microprocessor-based. The spindle synchronizer has a counter used to track the phase of a master phase reference signal that is distributed to all the disk drives in the storage system. The counter may also optionally be used to generate the master reference signal. The spindle synchronizer also has programmable registers and a comparator that are used to generate a spindle reference signal having a programmable phase offset relative to the master reference signal, and a register used to sample the phase of the master reference once per revolution of its associated spindle. The spindle controller contains a counter used to measure the actual rotational period of the associated spindle. The spindle phase error is used in a phase correction algorithm that controls a reference voltage supplied to a motor spin controller. The algorithm employs frequency switching to phase-lock the associated spindle with the spindle reference signal generated by the spindle synchronizer.
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Even William F.
Lewis William D.
Harrison David B.
Kapadia Varsha A.
Psitos Aristotelis
Quantum Corporation
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