I have a silver slim ps2. I purchased the Magic Keys II product that came with the three tools along with the two Swap Magic 3.6 disks. The first game I tried to back up was God of War, which happens to be a DL game. I burned the iso on Verbatim disks at 2.4x. When I try to load the game, it gives me a "not a valid PS2 disk" error. I don't want to waste any more dual layer disks since they are expensive , does anyone know what might be wrong.?