Patent ID: 7808868

Claim:
A method for determining a disk type and is suitable for a digital versatile disk (DVD) optical drive, wherein the DVD optical drive comprising a pickup head, a spindle motor, and a stepping motor, and a disk suitable for accommodating in the device, the method comprising: (a). moving the pickup head to a blank area with no data of the disk, and rotating the disk; (b). stopping the rotating disk; (c). irradiating the blank area with a laser beam in a first wavelength; (d). measuring the first time interval of the laser beam reflects from a surface of the blank area to the pickup head and a second time interval of the laser beam reflects from a reflective layer of the blank area to the pickup head; (e). calculating a time difference between the first time interval and the second time interval; and (f). comparing the time difference with a reference value to determine the disk type.