Recordable data device having identification symbols formed ther

Details Recordable data device having identification symbols formed ther Recordable data device having identification symbols formed ther

1986-04-24

1989-08-22

Faber, Alan

Dynamic magnetic information storage or retrieval

General recording or reproducing

Recording-or erasing-prevention

360133, G11B 1910, G11B 2303

Patent

active

048601284

ABSTRACT:
A recordable data device includes a case and a magnetic disk rotatably contained therein. There, in the case, an insertion opening through which a magnetic head of a disk drive device, constructing a part of a data processing system, can contact the magnetic disk, onto which a recessed identifying embossment has been formed. The magnetic disk drive device comprises an insertion opening or inserting the data recording device and an identifying symbol of a projected embossment which is formed near the insertion opening. When the recordable data device is loaded into the disk drive device, the recessed embossment of the identifying symbol of the magnetic disk is fitted into the projected embossment of the identifying symbol of the magnetic disk drive device. If the data recording device is authentic, the data processing system allows the disk drive device to data to or read data from the magnetic disk. If the embossed identifying symbols do not fit, the floppy disk, that is, the recordable data device, is rejected as not authentic and data-writing or data reading is prevented.

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