I've got a .iso file that is 2,121MB big and whenever I try to burn it to a 4.7GB DVD I get the message that there isn't enough space. I use Ubuntu and I use Brasiro to burn my DVD's, ive also tried the gui version and that didn't work either. I have no idea why it wouldn't work except that the video is alot larger than how much the iso compressed it, i used DeVeDe to compress it.