A dial-up connection is a last resort for downloading Tivo images, especially 2.5Xtreme. If you know someone that has a wideband connection see if they'll download it for you. There's too much chance of corrupting the image via dial-up and may account for the problems you're having. I would avoid IBM Deskstar drives like the plague. I've never heard anything good about them nor have I heard of anyone using them in a Tivo, but that doesn't mean someone hasn't done it successfully.
Please don't PM me or any other members looking for personal assistance. You'll do better by posting (after you've exhausted the search feature, of course) and taking advantage of the collective expertise of the membership instead of a single individual that may or may not be able to help you. Thank you and enjoy your stay at DDB!