Magnetic disk controller for backing up cache memory

Details Magnetic disk controller for backing up cache memory Magnetic disk controller for backing up cache memory

1996-12-05

1999-05-18

Swann, Tod R.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

39575002, 39575008, 39575006, G06F13/00

Patent

active

059059940

ABSTRACT:
A magnetic disk sub-system provides for sudden cutting off of a main power supply such as a power failure so that the backup by battery is effected to supply electric power to the cache memory from a battery upon cutting off of the main power supply in order to protect data in the cache memory and when the main power supply is cut off by operation of a main power supply switch the backup by battery is stopped to cut off supply of electric power to the cache memory from the battery after data in the cache memory is written into a magnetic disk unit and supply of electric power from the main power supply is then cut off. Further, the magnetic disk sub-system divides the cache memory into several portions so that the backup by battery can be controlled independently to thereby extend the backup period.

REFERENCES:
patent: 5007027 (1991-04-01), Shimoi
patent: 5313612 (1994-05-01), Satoh
patent: 5353430 (1994-10-01), Lautzenheiser
patent: 5448719 (1995-09-01), Schultz
patent: 5574920 (1996-11-01), Parry
patent: 5649156 (1997-07-01), Vishlitzky
patent: 5692204 (1997-11-01), Rawson
patent: 5754868 (1998-05-01), Yamamoto
patent: 5765001 (1998-06-01), Clark
patent: 5828823 (1998-10-01), Byers

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