What are you trying to copy? If it's not commercial movies i.e. copy-protected, you can just use Nero Burning ROM's DVD Copy. Set your source drive to one of the DVD drives and your destination (along the top bar, once you've gone through the wizard) to the other, and click BURN. This will work for data discs as well as Video DVDs. If you're trying to back up your personally-owned commercial movies, check out the Ripit4me and IMGBurn tutorials floating around the forums or possibly under Guides. There are some tools e.g. DVD Decrypter and DVDShrink which Ripit4me depends upon to work but it'll beat anything. FYI, it's best to have your newest, and preferably double-layer-capable drive, as your destination drive and your older or non-DL drive, if you have one, as your source. This gives you more options and usually better media compatibility.
