Multi-spindle synchronization control system for magnetic disk a

Details Multi-spindle synchronization control system for magnetic disk a Multi-spindle synchronization control system for magnetic disk a

1988-06-17

1990-04-17

Wolff, John H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 15, G11B 1928

Patent

active

049185446

ABSTRACT:
A multi-spindle synchronization control system for a magnetic disk apparatus includes a plurality of magnetic disk units each for receiving a reference clock pulse to control rotation of a spindle motor and detecting rotation of the spindle motor to generate an index pulse, a crystal oscillator for generating a master clock having a predetermined frequency, a counter for converting the master clock into a master index pulse generated upon each rotation of the spindle motor, and a plurality of spindle synchronization control circuits, each connected to a corresponding one of the plurality of magnetic disk units, for detecting a timing relationship between the master index pulse and the index pulse from the corresponding magnetic disk unit, omitting some pulses of the master clock in accordance with the detection result, and counting down the partially-omitted pulse train to output the reference clock pulse.

REFERENCES:
patent: 4618897 (1986-10-01), Johnson et al.
patent: 4809119 (1989-02-01), Tsuyuguchi et al.

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