Adaptive writing method for high-density optical recording apparatus and circuit thereof

An apparatus configured to write input data on an optical recording medium using a write pulse waveform including a first pulse, a last pulse and a multi-pulse train is provided. The apparatus includes a discriminator configured to discriminate a magnitude of a present mark, a magnitude of a leading space, and a magnitude of a trailing space from the input data, a write waveform controller configured to control the write pulse waveform based on a grouping table, the grouping table being configured to store rising edge data of the first pulse of the write pulse waveform grouped in corresponding pulse groups according to magnitudes of a plurality of present marks and magnitudes of a plurality of spaces adjacent to the plurality of present marks, the write pulse waveform being controlled to generate an adaptive write pulse waveform by varying a position of a rising edge of a first pulse of the mark to be written according to at least the magnitudes of the present mark and the leading space, and a processor configured to process the input data on the optical recording medium using the adaptive write pulse waveform. The discriminator is further configured to apply the magnitude of the present mark, the magnitude of the leading space, and the magnitude of the trailing space to the write waveform controller. The width of the first pulse is varied by varying the position of the rising edge.