The evaluated value {HEAD ~ Smn=Mm×} is calculated from {TAIL ~ a plurality} of different write power compensated values Pcn , the write power Pwm, and the modulation Mm 
The evaluated value { HEAD ~ Smn = Mm× } is calculated from { TAIL ~ a plurality } of different write power compensated values Pcn , the write power Pwm , and the modulation Mm
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH