Optical recording medium and optical recording process using the same

An optical recording process comprising the step of:

• irradiating a laser beam from a direction of a cover substrate to one of two recording layer structures disposed on a grooved substrate of an optical recording medium, so as to record in one of the two recording layer structures,
• wherein the laser beam has a recording power of 3 mW to 12 mW, wavelength of 360 nm to 420 nm and a spot diameter of 0.30 μm to 0.52 μm (1/e2), the grooved substrate has a width of 0.10 μm to 0.46 μm and a depth of 0.01 μm to 0.04 μm, and is formed with a pitch of 0.28 μm to 0.50 μm, the two recording layer structures include a first recording layer structure and a second recording layer structure, and the optical recording medium comprises:
• the cover substrate;
• the first recording layer structure;
• an intermediate layer;
• a separation layer;
• the second recording layer structure;
• and
• the grooved substrate,
• wherein the cover substrate, the first recording layer structure, the intermediate layer, the separation layer, the second recording layer structure and the grooved substrate are disposed in this order, the first recording layer structure includes, in this order, a first protective layer, a first recording layer which comprises Sb and Te as main components thereof, a second protective layer, a first inorganic layer which comprises metal as components thereof, the second recording layer structure includes, in this order, a third protective layer, a second recording layer which comprises Sb and Te as main components thereof, a forth protective layer, a second inorganic layer which comprises metal as a component thereof, a ratio (t/T1) of a thickness (T1) of the first recording layer structure and a thickness (t) of the intermediate layer is 0.2 to 1.0.