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