Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1996-05-31
1998-09-15
Hindi, Nabil
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369 50, 369 4413, G11B 700
Patent
active
058090061
ABSTRACT:
Copy-protected optical disk format, optical disk recording apparatus for creating disks having such formats and optical disk reading apparatus for reading disks having such formats and for determining whether the disks are authentic. In one aspect, an authentic optical disk has data bit indications along a spiral centerline of the disk, and these data bit indications define a radial wobble which has substantially greater energy at a predefined frequency f.sub.CPW (such as f.sub.CC /392) than at a frequency of f.sub.CC /196, where f.sub.CC is the spatial channel clock frequency. In another aspect, an authorized optical disk has data bit indications along a substantially spiral centerline of the disk, according to a channel clock whose frequency varies across the disk. The disk further has stored thereon an indication of the number of such channel clock cycles which occur along a predetermined test segment of the centerline, optionally together with a pointer to the test segment. Since normal data stream copying techniques do not copy the exact channel clock rates on the disk, and since the copying equipment will inherently introduce its own channel clock variations across the resulting disk, the predetermined test segment on the copy will not have the number of channel clocks as that specified by the data indicating the number of channel clock cycles to expect along the test segment.
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Davis Hedley C.
Keller Glenn J.
Nelson Craig A.
Cagent Technologies, Inc.
Hindi Nabil
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