Unisys Corporation

Burroughs, Inc.

Gary V Ruby

Laurence P Flora

Jeffrey Earl Epstein

A multiplicity of independently operating disk drive subsystems are coupled to a read/write interface containing error circuitry and data organizer circuitry. The data organizer circuitry organizes read/write data for read/write communication with the disk drive subsystems via the error circuitry such that the overall system appears as a large, high capacity disk drive system having an unusually high fault tolerance and a very high bandpass. Caching is additionally provided in the read/write interface in a manner which takes advantage of the organization provided by the data organizer to significantly improve overall performance. Advantage is also taken of the conventionally provided error detection capability of each disk drive subsystem to enhance the capability of the error circuitry.

High capacity multiple-disk storage method and apparatus having

A relatively large plurality of relatively small, independently operating disk subsystems are coupled to a read/write interface containing error circuitry and data organizer circuitry. The data organizer circuitry organizes read/write data for read/write communication with the disk subsystems via the error circuitry such that the overall system appears as a large, high capacity disk system having an unusually high fault tolerance and a very high bandpass.

High capacity disk storage system having unusually high fault tolerance

A system for modifying the output of individual bits of a fixed memory such as a ROM. Means are provided for recognizing the address of bit-locations requiring modification. The recognized addresses are organized into (a) those requiring the addition of a logic 1 bit or (b) those requiring deletion of a logic 1 bit. An output-data control package combines this information logically with the data bit existing in memory to provide a corrected data output bit on the required line of the ROM output bus. The system is also adaptable to 'Word-oriented' ROM's such that an improper word in memory may be modified to provide a corrected output word from the ROM.

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Pasadena, CA, United States of America

Gary V Ruby