Rotary memory storage device with cache control method and appar

Details Rotary memory storage device with cache control method and appar Rotary memory storage device with cache control method and appar

1996-10-10

1998-04-21

Swann, Tod R.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

711165, 711 4, 364DIG1, G06F 1300

Patent

active

057429332

ABSTRACT:
A rotary storage device includes a plurality of disk units, an upper-level interface circuit, a cache controller, a cache memory, and a control processor. In each disk unit, the storage area of each disk is subdivided into an ordinary user data area and a secondary cache data storage area including a group of consecutive cylinders. Data overflowed from the cache memory is sequentially written in the secondary cache data storage area so as to be later transferred therefrom to areas of the user data area according to addresses inherent thereto when traffic of upper-level input/output processing is relatively low. In the case of when data is sought to be accessed in the cache memory during a data read operation, access operations are performed first to the secondary cache data storage area and then to the user data area.

REFERENCES:
patent: 4371929 (1983-02-01), Brann et al.
patent: 4476526 (1984-10-01), Dodd
patent: 4835686 (1989-05-01), Furuya et al.
patent: 5551003 (1996-08-01), Mattson et al.

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