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 the recording layer 12, at which {HEAD ~ the laser beams} form {TAIL ~ 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 the recording layer 12 , at which { HEAD ~ the laser beams } form { TAIL ~ 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 OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH