Patent ID: 7580335
Filing Date: 2009-08-25
Classification: G11B

Abstract:
1. A recording apparatus to record sub data to an optical-disk recording medium comprising a substrate and at least a reflective layer and a 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 comprising: a read signal generating means for generating 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 recording means for recording the sub data by forming the marks in mark inserting positions on the reflective layer of the optical-disk recording medium, in accordance with a predetermined rule and a waveform-replaced read signal, with the laser light being controlled to have the writing power; and a waveform replacing means for replacing a waveform of the read signal generated by the read signal generating means, corresponding to a section having a predetermined length and including the mark inserting position, with a replacement waveform having a determined level, wherein the waveform replacing means is connected to the read signal generating means and the sub-data recording means.