In my computer, I have 4 internal CD ROM drives. A CD burner, a plane CD ROM player, a DVD buner and a DVD player. When I was burning 2 separate movies, while keeping DVDFab open, the first time, it opened the DVD burner drive once I had finished copying the movie to burn it. The 2nd movie, it opened my CD burner instead of opening my dvd burner. I had to close the cd burner, open the dvd burner in order to burn the 2nd movie. Plus, it kept asking me before it started the burn process if I wanted to burn at the recommended speed. I use the NERO engine as my burning engine.