A first data recorded region is formed in one of multiple recording layers of {HEAD ~ a rewritable optical disc} before {TAIL ~ a second data recorded region} is formed therein 
before
A first data recorded region is formed in one of multiple recording layers of { HEAD ~ a rewritable optical disc } before { TAIL ~ a second data recorded region } is formed therein
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH