Readable indelible mark on storage media

G - Physics – 06 – F

Patent

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Details

G06F 1/00 (2006.01) G11B 5/02 (2006.01) G11B 5/09 (2006.01) G11B 5/82 (2006.01) G11B 7/00 (2006.01) G11B 7/007 (2006.01) G11B 15/00 (2006.01) G11B 19/02 (2006.01) G11B 20/00 (2006.01) G11B 20/12 (2006.01) G11B 23/30 (2006.01) G11B 23/40 (2006.01)

Patent

CA 2336270

A storage media is disclosed and comprises a storage body and a readable indelible mark formed in the body such that portions thereof are indelibly altered. The mark is read by writing first data to the body in the region of the mark, and reading second data from the body in such region. The written first data is not accepted where the portions of the body are indelibly altered. Accordingly, the read second data corresponds to the written first data with segments thereof missing. The missing segments of the first data correspond to the portions of the body indelibly altered. In a preferred embodiment, the storage media comprises a magnetic rotatable disk having a substantially planar substrate and a magnetizable layer deposited thereon. The reading and writing are therefore performed magnetically.

L'invention concerne un support de mémorisation, comprenant un corps de mémorisation et une marque lisible indélébile formée sur ledit corps, de sorte que des parties de celui-ci sont modifiées de manière définitive. Pour lire cette marque, on écrit un premier ensemble de données sur le corps, dans la région de la marque, et on lit un second ensemble de données à partir du corps, dans cette région. Le premier ensemble de données écrites n'est pas accepté dans les parties du corps altérées de manière indélébile. En conséquence, le second ensemble de données lues correspond au premier ensemble de données écrites, des segments de celles-ci manquants. Les segments manquants du premier ensemble de données correspondent aux parties du corps altérées de manière indélébile. Selon un mode de réalisation préféré, le support de mémorisation comprend un disque magnétique rotatif possédant un substrat sensiblement plat et une couche magnétisable recouvrant ledit substrat. La lecture et l'écriture sont donc effectuées magnifiquement.

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