Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1996-05-30
1999-12-07
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 7704, G11B 2730
Patent
active
05999357&
ABSTRACT:
A method and apparatus for improving data integrity and density in an array of disk drives by synchronizing spindles prior to correcting for repeatable runout (RRO). The invention includes a drive control circuit for controlling synchronization, initiating runout cancellation calibration, and granting customer use of the disk drives. In a further aspect of the invention, rotation of the spindles is monitored for changes. The drive control circuit initiates resynchronization and recalibration of the runout cancellation for the disk drives in response to receiving an indication from the rotation detector that rotation of at least one of the spindles in the disk drives has changed. Initially, or after a change is detected, one of the disk drives is selected as a master and a synchronization signal is routed to each of the disk drives from the selected master drive for synchronizing the spindles in the disk drives. The rotation detector detects the addition and removal of a disk drive to the rack, and the addition and removal of a disk drive to or from the rack is equated with a change in the rotation of a spindle in the disk drives thereby triggering resynchronization of the spindles and recalibration of the runout.
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Habermehl James L
International Business Machines - Corporation
Psitos Aristotelis M.
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