Patent ID: 8305857

Claim:
An apparatus configured to write input data on an optical recording medium using a write pulse waveform, the write pulse waveform comprising a first pulse, a last pulse, and a multi-pulse train, the apparatus comprising: a discriminator configured to discriminate a magnitude of a present mark to be written, a magnitude of a leading space from the input data and a mark pulse group corresponding to the magnitude of the present mark, and a space pulse group corresponding to the magnitude of the leading space; a write waveform controller configured to select information on a position of a rising edge of the first pulse from a grouping table based on the discriminated mark pulse group and the discriminated space pulse group, and control the write pulse waveform to generate an adaptive write pulse waveform based on the selected information on the position of the rising edge of the first pulse, the grouping table comprising, based on a combination of the mark pulse group and the space pulse group, the information on the position of the rising edge of the first pulse; and a processor configured to process the input data on the optical recording medium based on the adaptive write pulse waveform, wherein a width of the first pulse is varied by varying the position of the rising edge.