Importance

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Abstract

A sub data recorder to record sub data on an optical-disk recording medium is provided. In one example, a sub data recorder records sub data by forming marks on a reflective layer of an optical-disk recording medium to which main data is recorded as a combination of pits and lands by irradiating laser light having a writing power to the reflective layer, the sub data can be recorded stably. An embodiment provides a recording apparatus to record sub data to an optical-disk recording medium formed from a substrate and at least a reflective layer and cover layer stacked on the substrate and to which main data is to be recorded as a combination of pits and lands formed on the substrate by irradiating laser light having a writing power to the reflective layer to form marks as the sub data on the reflective layer, the apparatus including a read signal generator to generate a read signal by detecting a return part of laser light having a reading power, irradiated to the optical-disk recording medium, a sub data recorder to record the sub data by forming the marks in mark inserting positions on the reflective layer of the optical-disk recording medium, determined in conformity to a predetermined rule, with the laser light being controlled to have the writing power, and a waveform replacing unit to replace a waveform of the read signal generated by the read signal generator, corresponding to a section having a predetermined length and including the mark inserting position, with a replacement waveform whose level has been set.

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First Claim