Nero won't recognise 800MB CD's

I’m trying to burn a 800mb CD but nero only recognises it at 703MB. What setting do I need to change for it to recognise the correct size? I’m using nero, win XP home SP2, liteon 851 DVDrw drive.

90 minutes and 99 minutes CD-Rs are all detected as 80 minutes (703MB) by any burner software. You have to enable Nero overburning to actually burn the full 90 min.