diode to irradiate a laser beam onto the optical disc 100 fig2 is a flowchart to help explain an optimum power calibration opc operation in the embodiment the id number recorded on the optical disc 100 is read step st 101 the target u03b2 value corresponding to the id number read in step st 101 and the recording speed is read from a table in which prepared internal memory step st 102 the recording speed has been specified by a host computer or a system controller the start power and step power for opc according to the recording speed are read on the basis of the start power and step power a table describing the order of recording power values as shown in fig3 is created step s 103 the recording power values are rearranged according to the recording order thereby creating a new table step st 104 for example when the optical disc 100 is a recordable digital versatile disc dvd the recording power values are rearranged as shown in fig4 moreover when the optical disc 100 is a recordable compact disc cd the recording power values are rearranged as shown in fig5 using the recording power values in the table obtained by rearranging the recording power values in step st 104 test recording is done in a power control area pca step st 105 the signal recorded in the pca of the optical disc 100 is reproduced and u03b2 asymmetry.