Patent ID: 7742374

Claim:
A method of recording data on an optical recording medium, including the step of: modulating a laser beam to emit a pulse series of laser including a write pulse of a write power and a cooling pulse of an approximately bottom power and irradiating the laser beam onto a recording layer of the optical recording medium so as to encode and write data to be recorded as recording marks of a length nT by using (n−1) write pulse(s) along a track of the recording layer, where n is an integer and T is one clock cycle, wherein when forming a recording mark of 4 T or longer, a cooling pulse T cb with a pulse width of 0.8 T to 2 T is inserted before a write pulse that is at the end of the pulse series, a cooling pulse T foff after the first write pulse has a pulse width of 0.4 T or over to less than 1.0 T, and a cooling pulse T off between the cooling pulse T foff and the cooling pulse T cb has a pulse width of 0.4 T or over to less than 0.8 T.