Roll mode for cached data storage

Details Roll mode for cached data storage Roll mode for cached data storage

1982-10-08

1986-04-15

Hoffman, James R.

Boots, shoes, and leggings

364900, G06F 1300

Patent

active

045831661

ABSTRACT:
A so-called "roll mode" technique provides block transfer with a disk-type of direct-access data-storage device (DASD). A set of chained commands for accessing record areas enables rapidly accessing a plurality of records within a given DASD cylinder of tracks. The rotational position of the surfaces is checked. The command within the chain, irrespective of its location, having the closest logical rotational proximity to the instant rotational position of the surfaces is selected as the first command in the chain. The chain is executed beginning at the indicated rotational position selected command through the end of the chain and then wrapped to the beginning of the original chain and continuing on until the command immediately preceding the rotational position selected command has been executed.

REFERENCES:
patent: 3569938 (1971-03-01), Eden et al.
patent: 3588839 (1971-06-01), Belady et al.
patent: 4198699 (1980-04-01), Caddell
patent: 4262332 (1981-04-01), Bass et al.
patent: 4403288 (1983-09-01), Christian et al.
patent: 4430701 (1984-02-01), Christian et al.
IBM Technical Newsletter, GN26-0351, Nov. 15, 1979, pp. 79, 80.
IBM Technical Disclosure Bulletin, May 1982, pp. 6605, 6606.
IBM Manual, "Type 7612 Disksynchronizer for Type 7303 Disk File", pp. 14, 15, circa 1960.
IBM Technical Disclosure Bulletin, Jun. 1970, pp. 93-95.
IBM Technical Disclosure Bulletin; Nov. 1969, pp. 815-817.

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