Patent ID: 6747931
Filing Date: 2004-06-08
Classification: G11B

Abstract:
A method for discriminating a type of an optical recording medium by detecting an RF signal and a focus error signal while performing a focus-searching as the optical recording medium is inserted, the method comprising:a first discriminating step for detecting a focus zero cross position from a focus error signal inputted during focus-searching, and discriminating whether the optical recording medium belongs to a CD group or to a DVD group by using a level of a focus search wave form detected from the focus zero cross position; and a second discriminating step for discriminating whether the optical recording medium discriminated as belonging to the CD group or the DVD group in the first discriminating step is a reproducing-only recording medium or a recordable recording medium by using an RF signal level or a focus error (FE) signal level, wherein, in the first discriminating step, if no focus zero cross position is detected from the focus error signal, the inserted optical recording medium is judged as belonging to the CD group.