a 690mb file while burning on cd shows 900mb which stops it from burning.

Recently I purchased RW cd 700 mb .I've 690mb video file which i wanted to play in TV so i buyed a RW cd and thought i would burn the video file onto the cd and will watch it on TC via DVD player.
My problem is that when i begin to burn the video file (I'm using NERO for that) it gives an error saying that a size limit is exceeding the size of the cd and it shows that around 900mb file is being written on the cd( i don't know how it is showing this cos size of the file is 690mb so it should get burned in the cd since it is under the size of the cd 690<700). Is there any way i can recover from this problem? I don't have a dvd writer otherwise i had bought a RW DVD.

thanks

 

yes my dvd player is capable of playing .avi files.