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