High speed searching of digital cassette

Details High speed searching of digital cassette High speed searching of digital cassette

1997-07-09

1999-07-13

Huber, Paul W.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 723, G11B 1518

Patent

active

059234903

ABSTRACT:
A searching and block access method on a digitally recorded continuous web media. The method enables a digitally recorded tape to be randomly positioned to access a specific requested data block. This method does not rely on scanning the information recorded on the tape to locate a requested data block. The tape is shuttled at high speeds to randomly requested locations. Tape positioning and control is accomplished by profiling the motion required to position the tape at the requested block relative to any current tape position. A tape directory of contents and tape position is recorded on the tape and cached within the drive controller. The cached version of the tape directory is used for random accesses. The random access ability enables the tape implementation to perform disk storage emulation.

REFERENCES:
patent: 4125881 (1978-11-01), Eige et al.
patent: 4398300 (1983-08-01), d'Alayer de Costemore d'Arc et al.
patent: 5179479 (1993-01-01), Ahn

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