Patent ID: 8004957
Filing Date: 2011-08-23
Classification: G11B

Abstract:
1. A recording and reproducing method for an information recording medium having a simulation write area, comprising: a step of erasing said simulation write area with an initial erasing power; a first simulation write step of setting a ratio between a recording power and an erasing power, a bottom power, and a multi-pulse width at fixed values, and recording first simulation write data on said simulation write area using the recording power and the erasing power as parameters; a step of reproducing said first simulation write data and calculating a first recording power on the basis of an evaluation index relating to a signal level of a reproduction signal; a second simulation write step of setting said first recording power, a first erasing power corresponding to said first recording power, and a first bottom power at fixed values, and recording second simulation write data on said simulation write area; a step of reproducing said second simulation write data and calculating a first multi-pulse width corresponding to an optimum evaluation index; a step of executing said first simulation write step when a difference is found between said first multi-pulse width and said multi-pulse width used in said first simulation write step, and setting said first recording power and said first bottom power as fixed values and recording third simulation write data on said simulation write area using the erasing power as a parameter when the difference is not found between said first multi-pulse width and said multi-pulse width used in said first simulation write; and a step of reproducing said third simulation write data and calculating an erasing power corresponding to the optimum evaluation index.