Recording and reproducing apparatus provided in each data block

Details Recording and reproducing apparatus provided in each data block Recording and reproducing apparatus provided in each data block

1992-02-26

1994-05-10

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692753, 369 47, 380 23, G11B 7007, G11B 2012

Patent

active

053114981

ABSTRACT:
An optical card apparatus including a recording device for recording in each of a plurality of data blocks in a card-like recording medium user data to be recorded along with data protecting information inhibiting the user data from being carelessly read out, and a reproducing device for reproducing the user data and data protecting information recorded in the recording medium. A data transfer controlling device for permitting the user data to be read out only in case the input secret information data coincide with the data protecting information recorded in the recording medium in the case of reproducing the user data with this reproducing device.

REFERENCES:
patent: 4979159 (1990-12-01), Tsuruoka et al.
patent: 5070490 (1991-12-01), Endo
patent: 5113061 (1992-05-01), Tanaka
patent: 5164577 (1992-11-01), Horie
patent: 5226026 (1993-07-01), Oshiba

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