When you buy a DVD-Ram you have to make sure that it is rated
for DVD+/-RW, it usually says in on the computer, or on the box
itself (if you bought the DVD-Ram separately) Most new DVD-Ram
drives have DVD-R, DVD+R, DVD+RW, DVD-RW, DVD-DL, DVD+DL. But there
are some companies that haven't implemented the + and the -