Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1993-03-25
1995-05-16
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
318 85, G11B 2719
Patent
active
054166489
ABSTRACT:
A hard disk drive spindle synchronization method comprises the steps of: sending an index marker pulse generated within each disk drive to mark in time a beginning of each rotation of the disk spindle thereof to a party line to which all drives are connected, rotating the disk spindle at a slightly different rotational velocity than any other drive of the array, monitoring drive pulses present on the spindle reference party line from other disk drives of the plurality to locate a center of gravity of pulse clusters which is within approximately plus or minus one quarter revolution of the drive's own index marker pulse, upon detection of a said center of gravity, ceasing to rotate the disk spindle at a slightly different rotational velocity during a second phase, adjusting the rotational phase of each drive to converge toward the center of gravity until all drive pulses present on the spindle reference party line converge into a single composite marker pulse present on the spindle reference party line, and maintaining convergence of the drive pulses during continuing operations of the disk drives by monitoring the spindle reference party line and making slight phase adjustments of the rotational phase of each drive, thereby phase locking all of the disk spindles of the plurality of hard disk drives to a single composite index marker signal present on the party line.
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patent: 4816937 (1989-03-01), Fukushima
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patent: 5303097 (1994-04-01), Baba et al.
Gibson, Redundant Disk Arrays: Reliable Parallel Secondary Storage, MIT Press .COPYRGT.1992 p. 77.
Jeppson David B.
Miller Benjamin M.
Harrison David B.
Psitos Aristotelis
Quantum Corporation
Wilson James T.
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