{TAIL ~ The determined Popt value} is then used to perform {HEAD ~ a write} on the optical disc 
{ TAIL ~ The determined Popt value } is then used to perform { HEAD ~ a write } on the optical disc
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH