Patent ID: 7839747

Claim:
A method of recording marks on an information layer of a record carrier, the method comprising acts of: irradiating an information layer with a pulsed radiation beam to record marks on said information layer, said information layer having a phase that is reversibly changeable between a crystal phase and an amorphous phase; and writing an even mark having a time length of nT by a sequence of n/2 pulses, where n denotes an even integer value selected from 4, 6, 8, or 10 and T denotes a length of one period of a reference clock, and an odd mark having a time length of nT by a sequence of (n−1)/2 pulses, where n denotes an odd integer value selected from 5, 7, 9 or 11, wherein a last pulse in the sequence of pulses for writing the odd mark has a period that is a first period difference Δ 1 p longer than a last pulse in the sequence of pulses for writing the even mark, a gap preceding the last pulse in the sequence of pulses for writing the odd mark has a first gap difference Δ 1 g longer than a gap preceding the last pulse in the sequence of pulses for writing an even mark, the first gap and first period differences Δ 1 g and Δ 1 p have an unequal duration not equal to T, a cooling gap succeeding the last pulse in the sequence of pulses for writing an odd mark has a period that is a second difference Δ 2 longer than a cooling gap succeeding the last pulse in the sequence of pulses for writing an even mark, and a sum of the first gap, first period, and second differences Δ 1 p , Δ 1 g , and Δ 2 is within a range from 0.7T to 1.1T.