The instructions say you must use a dvd -r or dvd -rw. Blank dvds. I bought a fifty pack of memorex blank dvd -r ‘s before I got the unit. After setting everything up an going to burn a dvd, I put it in the machine and machine tells me that , that disc is incompatible. It won’t work. So I checked the instructions that came with DVD burner and they said use jvc, Sony, or vertbaium dvd-r discs. So I bought a 50 pack of vertbaium dvd -r discs. Exact same thing happen. Disc incompatible. It won’t work. So I’ve spent more on unusable blank dvd -r discs then I spent on the machine to burn them. And still can’t burn the dvd.