SInce the upgrade of my first Tivo HD went so easil, I ordered another Hitachi Deskstar 31000 for my second Tivo HD - from PCBAY.Com through Amazon - a few $ less than the one from CompUSA (but with sales tax) - total with shipping was $72.79. Came in the same Hitachi box. Now that I have done one upgrade, timed this one - total time was just under 25 minutes - would have been faster but when I tried to run AAM from Hddscan, the AAM function was grayed out - turns out that the Hitachi drive shows up as the Cinemastar 1TB part instead. Since that is also supported, I decided to go ahead and use it. Sort of strange that Hitachi packaged the wrong part number inside the box - serial number was correct on the outside. Hooked up the drive next to the other upgraded HD, and was surprised that the new drive is quite a bit noisier than the Deskstar after AAM - the chart has them at the same level of 7. Rather than returnthe drive and do it all over again, guess I'll move some recordings/favorites and put the quieter one in the bedroom and the noisier one in the living room. All in all, nice to have two new Tivo HDs - I doubt I'll run out of space for awhile. Next step is to go ahead and return my Premiere - no need for it now. My old Series 2 is still running great after 7 1/2 years - maybe when that one goes I'll see what new Tivo is available. Again, thanks for the great instructions and support.