Raid system including first and second read/write heads for each

Details Raid system including first and second read/write heads for each Raid system including first and second read/write heads for each

1994-07-26

1997-03-18

Chan, Eddie P.

Dynamic magnetic information storage or retrieval

Head

Core

395439, 395441, 360109, G06F 1202

Patent

active

056130880

ABSTRACT:
A disk array apparatus, which has redundant data arranged in a distributing layout by record includes apparatus for speeding up redundant data updating processing during later updating, apparatus and a read head and write head securely mounted on a single actuator. In operation, old parity data is read out by the read head and then is used to generate new, updated parity data. The updated parity data is written into the record where the old parity data was held within one turn of the disk after the old parity data has been read out.

REFERENCES:
patent: 3729725 (1973-04-01), Denney et al.
patent: 4602301 (1986-07-01), Saito et al.
patent: 4740942 (1988-04-01), Ogino et al.
patent: 5155811 (1992-10-01), Dean et al.
patent: 5233483 (1993-08-01), Uchiyama
patent: 5339319 (1994-08-01), Yamane et al.
patent: 5487160 (1996-01-01), Bemis
A Case for Redundant Arrays of Inexpensive Disks (RAID), Patterson, et al., pp. 109-116.

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