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