Digital data formatting system for high density magnetic recordi

Details Digital data formatting system for high density magnetic recordi Digital data formatting system for high density magnetic recordi

1981-01-02

1983-01-04

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data in specific format

G11B 509

Patent

active

043674976

ABSTRACT:
Digital data is arranged into records for high density recording on a moving magnetic tape or other magnetic medium. A preamble and a postamble are formatted around a variable length data block to form a record for recording onto a movable magnetic medium. A unique character having a mirror image the same as the character is formatted after the preamble and before the postamble in order to allow recognition of the data when read in either forward or reverse direction. A flux change signal is always recorded in a ninth cell position of each character of the preamble, the postamble, the data and all other characters to be recorded, except in the ninth cell position of the unique character to insure a maximum of nine cell positions between successive clock signals and to permit immediate recognition of the end of a data block upon reading the unique character.

REFERENCES:
patent: 3795903 (1974-04-01), Lindsey
"Cartridge Tape Formatter & Interface" by T. G. Bolzno, Navy T.D.B. vol. 4 #8, Aug. 1979.

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