First of all, the configurations of {HEAD ~ an optical disc}, which is used as {TAIL ~ an information recording medium}, and an optical disc drive, which is used as an information read/write apparatus, will be described 
First of all , the configurations of { HEAD ~ an optical disc } , which is used as { TAIL ~ an information recording medium } , and an optical disc drive , which is used as an information read / write apparatus , will be described
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH