Patent ID: 7362682

Claim:
A method for recording data in an optical recording disc including a substrate and a recording layer formed on the substrate and containing a phase change material as a primary component and constituted so that data can be recorded therein and data recorded therein can be erased by projecting thereonto at a high linear velocity equal to or higher than a predetermined linear velocity a laser beam whose power is modulated in accordance with a pulse train pattern including a plurality of kinds of unit pulse train patterns each having at least a recording pulse whose level is set to a recording power and a bottom pulse whose level is set to a bottom power onto the recording layer and forming a plurality of recording marks having different lengths in the recording layer, wherein among the plurality of kinds of unit pulse train patterns used for forming recording marks having different lengths those, other than the unit pulse train pattern used for forming the shortest recording mark, are determined so that they include recording pulses in a number corresponding to the length of the recording mark to be formed, that all corresponding recording pulses included therein have a common pulse width and that each of them includes a last bottom pulse at the end thereof whose pulse width is determined in accordance with the length of the recording mark to be formed.