My DVD drive is the Toshiba DVD-ROM SD-R5002, currently I am having troubles burning DVD's. I have tried several programs for burning DVD's, none of which have worked, all failing at "insert writable dvd". I know my burner can handle burning DVD's as I did it several times before reformatting. Now, however, it will not register a blank DVD is in. Is the problem maybe the disks? (Memorex DVD+R 4x "High Speed"). I know my burner isn't 4x, but it should still at least register the blank dvd is in, right? Any ideas what's wrong?