With reference to FIG 7, user data is recorded in the whole of {TAIL ~ the data area} 314 of the first recording layer 301 along a scanning direction 531 to form {HEAD ~ a full range} used data area 511 
With reference to FIG 7 , user data is recorded in the whole of { TAIL ~ the data area } 314 of the first recording layer 301 along a scanning direction 531 to form { HEAD ~ a full range } used data area 511
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH