When I make an ISO file with CloneDVD I have the setting on DVD-5 (I believe that's what its called). When I make an ISO of a movie that is 1 hour 30 minutes long...the iso file is less than 4 Gigs and when I burn the disc it has some "unburned" space. Should I be setting a custom setting and if so, what size should I put it at (if I have the ability to do it). I know when I use to use DVD Shrink I would have it make the file a certain size and that's what it would be (unless it was a short movie). Example: When I backed-up "The Number 23"...it's was only 95 minutes and I had extra space it could of used when I burned it to a disc. Thus, I probably lost some quality in the compression.