Hi a 2 part question here . I'm trying to back up a movie of mine that's larger that 4.5 gb. I have a dvd burner but i'm not sure if it's dual layer. How do i check that? I understand that i can fit movies 4.5 gb or smaller on a regular dvd-r without loosing any quality ,but, if movies are larger than 4.5 gb (say 8.5 gb) will dual layer allow me to fit this 8.5 gb movie on to one cd without loosing quality (i don't want to compress the 8.5 to fit on a 4.5 because of the quality lost)? I use DVD Decrypter and DVD Shrink.