{HEAD ~ The relationship} between at {TAIL ~ the determined PcO value} and SmO is subjected to linear approximation, and the compensated write power PthO that provides a modulation of zero, that is, an evaluated value SmO of zero, is determined 
{ HEAD ~ The relationship } between at { TAIL ~ the determined PcO value } and SmO is subjected to linear approximation , and the compensated write power PthO that provides a modulation of zero , that is , an evaluated value SmO of zero , is determined
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