Neither of these programs will create a bit-for-bit backup of your dvd's, they decrypt, decompress, and recompress the videos taking a huge chunk out of the quality, some of them do not even re-encode the audio with dolby digital or DTS. if you have power DVD or windows media player you can do this. Insert the DVD or BD and open either power dvd or wmp and play the first few seconds of the actual movie. this allows the computer to obtain the decryption code for that disc and allows it to read the disc and "unscramble" the data as it is doing it. leave PDVD or WMP open. stop playback and go into my computer, right click on the DVD/BD drive and click "open" now minimize this window and go to wherever you intend to store the backups and create a folder for the files, now go back into the dvd window and select everything and right-click and hit copy, not go into the folder you intend to back up into and right click and hit paste. this will copy the entire contents of the disc onto the hardrive. keep in mind this uses a HUGE amount of disc space but it is the only way to back up a DVD or BD exactly bit for bit.