A simpler solution might be mounting the .MDS to a virtual drive in Daemon Tools Lite (Free for personal use) and/ or using DVD Decrypter 3.5.4.0 to burn it. (Google will help you find both.) These programs always do the job for me, anyhow.
EDIT: BTW, By "Google will help you find both", I mean Google the search engine, not Google the forum Admin.