Method and device for recording data in an optical memory card

Details Method and device for recording data in an optical memory card Method and device for recording data in an optical memory card

G - Physics

11

B

G11B 7/007 (2006.01) G11B 7/0033 (2006.01) G11B 19/04 (2006.01) G11B 20/12 (2006.01) G11B 7/013 (2006.01)

Patent

CA 2242195

A method and a device for recording data in an optical memory card which facilitate judgment between an unrecorded region and a recorded region in the optical memory card and which prevent double writing. Record pits are formed so that data to be recorded on the optical memory card is recorded in the same way as when recorded in the MFM-RZ modulation system. Data that was recorded in the NRZI-RZ modulation system is reproduced and the modified to record in the MFM-RZ modulation system. This method forms the record pits at least every two recording intervals or less in the recorded region in the optical memory card, making it possible to fudge the unrecorded region of the optical memory card from the recorded region according to presence or absence of the record pits and thereby preventing double writing.

L'invention concerne un procédé et un dispositif pour enregistrer des données dans une carte optique, qui facilitent la distinction entre une zone non enregistrée et une zone enregistrée de la carte optique et qui empêchent la superposition d'écriture. Des alvéoles sont formées de sorte que les données à enregistrer sur la carte optique soient enregistrées de la même manière que dans le système de modulation de fréquence modifiée et d'enregistrement avec retour à zéro (MFM-RZ). Les données enregistrées dans le système de modulation NRZI-RZ sont reproduites puis enregistrées dans ledit système de modulation MFM-RZ. Ce procédé consiste à former des alvéoles au moins tous les deux intervalles d'enregistrement ou moins dans la zone enregistrée de la carte optique, ce qui permet de distinguer la zone enregistrée de ladite carte de la zone non enregistrée selon que des alvéoles d'enregistrement sont présentes ou non et d'empêcher ainsi la superposition d'écriture.

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