Patent ID: 7564754

Claim:
A disk apparatus for reproducing information data recorded in an optical disk, comprising: signal level detect means for rotating an optical disk loaded into the disk apparatus at a given number of rotations and turning on a focus servo in the off state of a tracking servo to detect the amplitude of an RF signal read out from the optical disk by an optical pickup at every given time intervals; first determining means for determining whether the maximum value of the amplitude of an RF signal detected by the signal level detect means is equal to or larger than a first reference level and the minimum value of the detected amplitude of the RF signal is equal to or smaller than a second reference level or not; counting means, when the first determining means determines that the maximum value of the amplitude of the RF signal detected by the signal level detect means is equal to or larger than the first reference level and the minimum value of the detected amplitude of the RF signal is equal to or smaller than the second reference level, for counting the number of RF signals the amplitudes of which detected by the signal level detect means are equal to or larger than the first reference level as the number of detected times of CAPA (Complimentary Allocated Pit Address) areas; second determining means for determining whether the optical disk has been rotated a given amount or not; third determining means, when the second determining means determines that the optical disk has been rotated a given amount, for determining whether the number of detected times of CAPA (Complimentary Allocated Pit Address) areas counted by the counting means is at least equal to or larger than a given number of times or not; and fourth determining means, when the third determining means determines that the number of detected times of CAPA (Complimentary Allocated Pit Address) areas counted by the counting means is equal to or larger than a given number of times, for identifying the optical disk loaded into the disk apparatus as a DVD-RAM optical disk and, when the third determining means determines that the number of detected times of CAPA (Complimentary Allocated Pit Address) areas counted by the counting means is not equal to or larger than a given number of times, for identifying the optical disk loaded into the disk apparatus as other optical disk than the DVD-RAM optical disk.