Windows media player doesnt let me burn cd!!!!!?

i wana burn songs onto a cd (data cd type) and the limit is 700mb right? well, i only have 699 mb of songs, and when i put burn, some songs at the bottom says "may not fit" and when it is burning, they are automatically unclicked. WTF?!?! its so stupid and annoying. i have less than what the cd holds, and it says that about 10 songs will not fit. someone please help. stupid wmp...