I just got an external NEC ND-3500A dvd burner. I bought a spindle of 50 fujifilm DVD-R's. I tried backing up a dvd movie using Nero, CopytoDvd, and cloneDVD, and all of them just give me an error and wont burn. I've wasting so many DVD-R's. I have no idea what to do now. I even downloaded a firmware upgrade and DMA is enabled.