Pre-block ID mark for multi-directional block location when...

Details Pre-block ID mark for multi-directional block location when... Pre-block ID mark for multi-directional block location when...

2005-09-20

2005-09-20

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

Reexamination Certificate

active

06947241

ABSTRACT:
An asynchronous method for locating individual blocks of data in a tape drive, without having to read the blocks of data is provided. The invention comprises placing an ID mark adjacent to the data blocks and inter-block gaps on the tape. The ID mark contains a small amount of information about the next respective data block on the tape. The ID mark is encoded such that the same detection mechanism that detects the inter-block gap can also retrieve the ID mark information, without having to process the entire block of data associated with a particular ID mark. The ID mark is symmetrical such that it can be detected and decoded in the forward and backward direction, allowing the tape drive to find a desired block of data by searching either forward or backward, even when the magnetic tape uses a unidirectional data format.

REFERENCES:
patent: 5321558 (1994-06-01), Tackett
patent: 6118605 (2000-09-01), Call et al.
patent: 6665137 (2003-12-01), Zweighaft et al.

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