Method of scanning a recording disc for defects, and...

G - Physics – 11 – B

Patent

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G11B 20/18 (2006.01) G11B 7/0037 (2006.01) G11B 7/09 (2006.01)

Patent

CA 2344387

A method and a DVR video recorder (20) for recording real time video signals on a DVR disc (1) are described. The disc may exhibit two-dimensional spot defects (11; 12; 13) but the DVR error correction system is very powerful and is capable of correcting errors as a result of small spot defects (11; 12). In order to examine in a rapid and efficient manner whether the disc has large spot defects (13), the integrity of predetermined test tracks (2T) is assessed on the basis of the tracking signal. When a defective test track (2T2; 2T3) is found the proximity of said test track is examined further. If the number of affected tracks appears to be small, recording in these tracks is allowed; if the number of affected tracks appears to be large, these tracks are entered in a defect list, which is preferably recorded on the disc. During recording the tracks appearing in the defect list are skipped.

L'invention concerne un procédé et un enregistreur vidéo numérique (DVR) (20) permettant d'enregistrer des signaux vidéo en temps réel sur un disque (1) DVR. Le disque peut présenter des défauts (11, 12, 13) ponctuels bidimensionnels, mais le système de correction d'erreurs DVR, très puissant, permet de corriger des erreurs résultant de défauts ponctuels mineurs (11, 12). Afin d'examiner rapidement et efficacement si le disque recèle des défauts ponctuels importants (13), on évalue l'intégrité de pistes d'essai prédéterminées (2T) en fonction du signal de guidage. Si l'on découvre une piste d'essai défectueuse (2T2, 2T3), on poursuit l'examen des abords de ladite piste. Si le nombre de pistes touchées est faible, on peut enregistrer sur lesdites pistes. En revanche, si ce nombre est important, on inscrit lesdites pistes sur une liste de défectueux, laquelle est, de préférence, enregistrée sur le disque. Lors de l'enregistrement, les pistes figurant sur la liste de défectueux sont sautées.

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