The session start information indicates whether or not {HEAD ~ the new sequential recording unit} is a start of {TAIL ~ the new session} 
The session start information indicates whether or not { HEAD ~ the new sequential recording unit } is a start of { TAIL ~ the new session }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL