Jon Snow

I'm trying to burn a ripped copy of a blu-ray movie(43.3 GB) from my hard drive to a 25GB BD-RE,when I press the calculate button to see the size of my compilation I get 186%. I know this is going to be to big to burn but I continue anyways. I hit the build button and I get "There doesn't appear to be enough space to burn this image." what am I suppose to do now? doesn't IMGBurn use compression? I appreciate if someone could give me some advice to get around this problem. Kinda lost Dan Reeve