The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 14, 1995
Filed:
Jun. 02, 1992
David W Gordon, Boulder, CO (US);
EMC Corporation, Hopkinton, MA (US);
Abstract
A redundant array based data storage system used in computer systems for reducing the amount of time required to modify data records stored in the redundant array. The storage system reduces the number of transmissions between a storage unit within the redundant array and the array controller by incorporating a parity storage unit which is programmed to perform operations necessary to the calculation of a 'parity code' which is used for error detection and correction. By integrating the redundancy information generation into the storage unit used to store the parity information, the number of transmissions between various component parts of the system is reduced, and so the amount of time required to perform a 'read-modify-write' operation is reduced. Disk-type parity units having more than one read/write head are used to further increase the performance of the storage system by reducing the disk rotational latency time.