I'm having trouble doing more than one copy per session successfully. I always copy and convert to my hard drive then burn from the hard drive. When I copy a disc then try to make a copy of another disc without exiting the program I'm prompted that the disc exists already. For example I have a whole series of 4.3 discs on my drive c: and two dvd burners I'll set two tasks one per 4.3 disc. Once the first completes when imgburn is through DVDFab acts like it has to redo a 4.3 write to the hard drive again. I have to shut the program down then it will work fine.