Patent ID: 7110335

Claim:
A recording and reproducing method for an optical recording medium, comprising following steps of: forming at least a recording layer laminate in the optical recording medium, the recording layer laminate comprising at least two subsidiary recording layers each having one type of metal as a main component, the recording layer laminate being to be irradiated with a laser beam with a wavelength in a range of 200 nm to 450 nm, at a recording-transferring rate of at least 35 Mbps, so that the main component metals contained in the respective subsidiary recording layers are thereby diffused and mixed to form an irreversible recording mark; and setting laser powers Pw and Pr such that a ratio of the laser powers Pw/Pr belongs in a range of 2.0 to 8.0, wherein the laser power Pw denotes a laser power of the laser beam used for recording to form the recording mark, and the laser power Pr denotes a laser power of laser beam used for reproduction by reading the recording mark thus formed.