Dual data check apparatus

Details Dual data check apparatus Dual data check apparatus

1990-05-11

1993-02-09

Beausoliel, Robert W.

Excavating

371 683, 371 101, G06F 1116

Patent

active

051857480

ABSTRACT:
A dual data check apparatus is included in a system which includes at least one pair of electronic disk units which store identical data and an electronic disk controller connected to the two electronic disk units through an interface which can realize daisy-chain connections. One of the pair of electronic disk units includes an output unit for supplying to the interface data corresponding to a read command sent from the electronic disk controller. The other of the pair of electronic disk units includes a unit for fetching the data supplied from the output unit to the interface, comparing the fetched data with data read out in the other electronic disk unit in response to the read command, and signaling an error event to the electronic disk controller when a comparison result represents a noncoincidence.

REFERENCES:
patent: 3544777 (1970-12-01), Winkler
patent: 3978327 (1976-08-01), Huber
patent: 4176258 (1979-11-01), Jackson
patent: 4792955 (1988-12-01), Johnson et al.
patent: 4843608 (1989-06-01), Fu et al.
IBM Tech. Disc. Bulletin, vol. 18, No. 4, pp. 1011-1013, Sep. 1975.

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