As shown in FIG 1, an optical disk 11 is rotated by a motor 12, and duringthis rotation, data is written to the optical disk 11 through an optical head 13, or {HEAD ~ data} recorded on the optical disk 11 is read through {TAIL ~ the optical head} 13 
is read through
As shown in FIG 1 , an optical disk 11 is rotated by a motor 12 , and duringthis rotation , data is written to the optical disk 11 through an optical head 13 , or { HEAD ~ data } recorded on the optical disk 11 is read through { TAIL ~ the optical head } 13
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 OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH