I wouldn't use the write capability of TDA if I were you. DVDDecrypter is rock-solid for ISO burning. BTW, when I tried out Nero for awhile, it really farked every other burning app I had, TDA included, but not DVDDecrypter. Hmm, advantages of ISOs? Eh, somebody else can comment on that. Anyway, two tools are must-haves to deal with ISO images: Daemon Tools and Image Tools Classic. You can mount images with the former, create ISOs from files with the latter.