The laser beam 17, which have reached the medium surface, transmits through the transparent protective resin layer 14 and the dielectric layer 13 to reach {HEAD ~ the recording layer} 12, at which {TAIL ~ the laser beams} form a focus 18 
The laser beam 17 , which have reached the medium surface , transmits through the transparent protective resin layer 14 and the dielectric layer 13 to reach { HEAD ~ the recording layer } 12 , at which { TAIL ~ the laser beams } form a focus 18
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH