i believe in the originating post, you asked for "how many minutes can i fit on one cd" so i answered it... if the file is 1.8 megs, and you can fit lets say 700mb on a 700mb disc than the ratio 700/1800, which is the same as 7/18 will be roughly the same ratio as ( the number of minutes on one disc/the number of minutes in the whole movie), doesn't that make sense?