Data playback system for random selections

Details Data playback system for random selections Data playback system for random selections

1986-08-22

1988-11-22

Cardillo, Raymond F.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 34, 369 41, 360 69, G11B 1722, G11B 2728

Patent

active

047870737

ABSTRACT:
In a data playback system in which multiple disks are stored in a magazine, a first random number is generated to select one of the disks believed to be present in the magazine, or temporarily, on the turntable. A disk fetch is attempted and it is determined from the success of the fetch whether or not the disk is present. If not, a memory is updated to eliminate such disk from a catalog and disk selection is repeated. Then a table of contents is read, either from the disk or from a previously written random access memory. A second random number selects a block of data on the selected disk for playback. If the table of contents is stored in random access memory, it is completed as the information becomes available. Then the process is repeated for other randomly selected disks and data blocks.

REFERENCES:
patent: 3575559 (1971-04-01), Tierney
patent: 3625519 (1971-12-01), Danielsen et al.
patent: 4180838 (1979-12-01), Fehrenkamp
patent: 4527265 (1985-07-01), de Costemore d'Arc
patent: 4539663 (1985-09-01), Ishibashi et al.
patent: 4667314 (1987-05-01), Iwashima

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