Patent ID: 7719941

Claim:
A method for determining whether an optical disk is a normal disk, a blank disk, an invalid optical disk or a recordable disk according to a radio frequency integration filtering signal, the method comprising the steps of: moving an optical head to an initial position, which is distant from an inner ring of the optical disk by a predetermined distance; rotating the optical disk and making focus, moving the optical head toward the inner ring until the optical head is moved to a home position or the focus fails, reading the radio frequency integration filtering signal, and recording a maximum and a minimum of the radio frequency integration filtering signal; stopping the optical head, determining whether a difference between the maximum and the minimum of the radio frequency integration filtering signal is greater than a predetermined threshold value, and identifying the optical disk as the recordable disk if the difference is greater than the predetermined threshold value; if the difference is smaller than or equal to the predetermined threshold value, moving the optical head toward an outer ring of the optical disk for a predetermined time and then enabling a tracking control, and identifying the optical disk as the blank disk and stopping operating if the tracking control fails; and reading data recorded on the optical disk and identifying whether the data is successfully decoded if the tracking control succeeds, identifying the optical disk as the invalid optical disk and then stopping operating if the data decoding fails, and identifying the optical disk as the normal disk and playing the optical disk if the data decoding succeeds.