There are still flaws in D2O, for example when I backed up the movie "Bridge On The River Kwai" I noticed that the disk (or files on it) had been created in an odd way. The disk is not a flipper, but on what was clearly a Dual Layer disk, the movie was in two parts both about 1 hour 23 minutes long. Stripping all the files off and trying to process as a single movie was impossible, a full disc copy yielded a set of files larger than a DVD-5 disc, and the only solution was to rip the two 1 hour 23 min chunks and then join them. This worked perfectly, but is an illustration of how D2O can be tripped up and is cetainly nees some work yet. I also had problem backing up Star Trek IV, an error indicated the original disk had not been un-encrypted in File mode...it had. In the end I had to resort to DVDShrink to back the disc up for some reason. This may of course have been deliberate duff data put on the original disc to hamper the backing up process.