Hard disc drive for use in a multiple drive data storage system

Details Hard disc drive for use in a multiple drive data storage system Hard disc drive for use in a multiple drive data storage system

1991-10-31

1993-09-28

Nelms, David C.

Electricity: motor control systems

Specific control circuit element or device

Computer or microprocessor

318603, 360 7303, 369189, G05B 1929

Patent

active

052492540

ABSTRACT:
A data storage system comprised of a plurality of disc drives which each comprise a plurality of data storage discs rotated by a polyphase motor. Each disc drive has a servo system for radially positioning transducer heads proximate the disc surfaces and generating an index signal for a selected orientation of the discs. A reference signal generator in each disc drive produces a reference signal at each of a succession of time intervals equal to the desired period of rotation of the discs and the disc drives are interconnected to enable each disc drive to sense a reference signal generated by any other disc drive. Each disc drive includes a microcomputer that is periodically interrupted and, during the interrupt, transmits the reference signal generated by the disc drive to the other disc drives in the absence of reception of a reference signal from another disc drive prior to the interrupt to provide a common reference signal for all of the disc drives. The speed of the motor of each disc drive is controlled in relation to the time interval between generation of the index signal in the disc drive and generation of the common reference signal. Alternatively, each disk drive can be operated independently to control the motor speed in relation to the time between successive index signals.

REFERENCES:
patent: 4514671 (1985-04-01), Louth
patent: 4890045 (1989-12-01), Ishizuka
patent: 5159503 (1992-10-01), Mitamura et al.

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