I recently purchased a rather expensive DVD player that can play .avi files. However, I discovered that it will only play them after they have been burned to a DVD that has been Mastered formatted. This requires a new, unformatted disc. I use -RW discs. I have plenty of those -RW discs but they all have been used for various reasons. Vista's default format is the Live file system which causes my player to give a UNKNOWN DISC indication. So my question is this: Is there any way a used DVD -RW can be reformatted to the Mastered format?