Patent ID: 6633534
Filing Date: 2003-10-14
Classification: G11B

Abstract:
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.