Method for distinguishing original of a magnetically recorded me

Details Method for distinguishing original of a magnetically recorded me Method for distinguishing original of a magnetically recorded me

1987-08-06

1988-09-27

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Recording-or erasing-prevention

G11B 1504

Patent

active

047746025

ABSTRACT:
In order to distinguish the original of a magnetically recorded medium such as floppy disc from its duplicates, the present invention proposes that the ID field part and the data field part are recorded successively in the floppy disc to be the original, and then both these ID field part and the data field part are read out successively at the time of its reproduction, thereby detecting a phase difference at the splice point of the data field part, thus being able to determine whether the floppy disc is original, or not.

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