{HEAD ~ ninth means} for holding {TAIL ~ a portion} of the recording management information in one of the recording management areas of the first and second recording layers which relates to the second on disc position during the simply reformatting of the disc by the eighth means 
{ HEAD ~ ninth means } for holding { TAIL ~ a portion } of the recording management information in one of the recording management areas of the first and second recording layers which relates to the second on disc position during the simply reformatting of the disc by the eighth means
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH