Patent ID: 7382706

Claim:
A material for use in a recording layer of an optical storage medium in which data is recorded by controlling emission of a light beam to the recording layer, the material comprising a composition containing at least Ag, In, Sb, and Te, wherein the composition of the material used in the recording layer is configured such that, when a linear velocity of rotation of the medium is set substantially in a speed range higher than 5.6 m/s and up to 28 m/s, a multi-pulse waveform representing a sequence of mark and space portions included in a light source driving power according to a modulated data signal is set such that each mark portion has a pulse width corresponding to a multiple of a period T of a given write clock, the multi-pulse waveform including a front-end portion fp, a multi-pulse portion mp and a tail-end portion op, the front-end portion having a first pulse width with a high-power level Pw and starting from a middle-power level Pe, the multi-pulse portion including a sequence of write pulses each having a second pulse width with the high-power level Pw and a third pulse width with a low-power base level Pb, and the tail-end portion having a fourth pulse width with the base level Pb and ending at the middle-power level Pe, and such that the first pulse width of the front-end portion ranges from 0.1T to 1T and the fourth pulse width of the tail-end portion ranges from 0.2T to 1.3T, and the recording layer is capable of recording data to meet the requirements: −15≦asymmetry ≦5, and contain information related to the multi-pulse waveform.