DVD or CD? THere's a difference. And what your drive is makes a difference. Some want one thing, some want another. Go to your drive manufacturer's site and see what the requirements are. If I were interested in permanent storage, no need to spring for the more expensive read-write [RW] discs. Personally, I'm betting the CDs remain readable by future machines, while I'm not so sure about the current mismash of DVD storage.