Patent ID: 7940623

Claim:
A method of recording marks representing data in a recording medium, said recording medium comprising an information layer having a phase which is reversibly changeable between a crystal phase and an amorphous phase, by irradiating the information layer with a pulsed radiation beam, each mark being written by a sequence of pulses comprising at least one write pulse, the written marks being erasable by irradiating the information layer with a radiation beam having an erase power level, a first write pulse of a sequence of pulses being preceded by a cooling pulse having a cooling power level which is lower than the erase power level, said radiation beam being generated by a radiation source, characterized in that a last write pulse of a sequence is directly followed by a rear heating pulse having a rear heating power level, the rear heating power level being higher than the erase power level, and the rear heating power level being a different level from said last write pulse.