{TAIL ~ A power adjustment method} in which a modulation index is calculated from reproduced signals of patterns recorded by irradiating {HEAD ~ light} onto an optical information recording medium with a recording power varied and an optimum power of irradiation light is set up using the modulation index 
{ TAIL ~ A power adjustment method } in which a modulation index is calculated from reproduced signals of patterns recorded by irradiating { HEAD ~ light } onto an optical information recording medium with a recording power varied and an optimum power of irradiation light is set up using the modulation index
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