Roll mode for cached data storage

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

G - Physics

06

F

354/241

G06F 12/00 (2006.01) G06F 12/08 (2006.01) G06F 13/00 (2006.01)

Patent

CA 1197021

ABSTRACT OF THE DISCLOSURE 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 o until the command immediately preceding the rotational position selected command has been executed.

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