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