METHOD OF SCANNING A RECORDING DISC FOR DEFECTS, AND RECORDING DEVICE FOR RECORDING INFORMATION ON A DISC-SHAPED RECORDING MEDIUM.

摘要

A METHOD AND A DVR VIDEO RECORDER (20) FOR RECORDING REAL TIME VIDEO SIGNALS ON A DVR DISC (1) ARE DESCRIBED. THE DISC MAY EEXHIBIT TWO-DIMENSIONAL SPOT DEFECTS (11;12;13) BUT THE DVR ERROR CORRECTION SYSTEM IS VERY POWERFUL AND IS VERY POWERFUL AND IS CAPABLE OF CORRECTION ERRORS AS A RESULT OF SMALL SPOT DEFECTS (11;12). IN ORDER TO EXAMINE IN A RAPID AND EFFICIENT MANNER WETHER THE DISC HAS LARGE SPOT DEFECTS (13), THE INTERGRITY OF PREDERTERMINED TEST TRACKS (2T) IS ASSESSED ON THE BASIS OF THE TRACKING SIGNAL. WHEN THE DEFECTIVETEST 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.(FIG 1)