Patent ID: 8040770
Filing Date: 2011-10-18
Classification: G11B

Abstract:
1. A recording method for recording information on a multilayered optical disc having a plurality of recording layers, the method comprises: a first step of performing a recording power adjustment process to adjust a recording power in each of the recording layers of the multilayered optical disc and also performing a shift test writing process to adjust a pulse condition of a recording pulse with regard to only some of the recording layers; a second step of predicting, based on a processing result of the recording power adjustment process and a processing result of the shift test writing process, a processing result of a shift test writing process in each of the recording layers to which the shift test writing process has not been performed; and a third step of recording the information on at least one of the recording layers of the multilayered optical disc to which the shift test writing process has not been performed while adjusting the pulse condition of the recording pulse based on the processing result of the shift test writing process or a prediction result of the second step, wherein in the second step, a pulse condition of the recording pulse in each of the recording layers is predicted in such a manner that with regard to a recording layer having a smaller adjustment value of a recording power obtained by the recording power adjustment process than the recording layer to which the shift test writing process has been carried out, a rising edge of the recording pulse is shifted to a direction to reduce a pulse width of the recording pulse and also a falling edge of the recording pulse is shifted in a direction to increase a pulse width of the recording pulse, while with regard to a recording layer having a larger adjustment value of a recording power obtained by the recording power adjustment process than the recording layer to which the shift test writing process has been carried out, a rising edge of the recording pulse is shifted to a direction to increase the pulse width of the recording pulse and also the falling edge of the recording pulse is shifted in a direction to decrease a pulse width of the recording pulse.