Optical disk and optical disk drive
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsYoshihiro Tosaki, Akira Matsubara, Tomiharu Hosaka, Toshiaki Kunieda
Life of this patent
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Abstract
A write-once DVD 1 has a lead-in area 4 provided inside a data area 5 where digital information on a document, image sound or the like is recorded, which includes prepits 9 holding copy managing key information for preventing unauthorized copy from a source disk to the DVD 1. The DVD has also a test area 3 provided inside the lead-in area 4, which is used for adjusting the power characteristics of the DVD 1. In the DVD 1, information recorded in the source disk can be. physically prevented from being copied into the DVD 1 without good cause on the basis of the copy managing key information recorded in the prepits 9.
Claims10
An optical disk, in which requisite information of a digital type can be written into a recording layer that is read using a light, said optical disk comprising:
- a data area having a groove extending along a spiral track, said data area being able to record said requisite information in the recording layer within the groove;
- a lead-in area disposed at a position preceding said data area, said lead-in area being able to record information for managing the optical disk;
- and
- a pre-groove area disposed at a position preceding said lead-in area, said pre-groove area having a pre-groove extending along said track, wherein
- a prepit section is provided at a position corresponding to said track within said lead-in area, said prepit section including at least prepits which have previously stored key information relating to a regulation against copying information into the optical disk, and other prepits which have previously stored information for identifying whether the optical disk is provided with said prepits.
Dependencies are inferred from the claim text.