I have two 6-year-old TiVo Premieres. When I got them, I swapped out the original drives for 3-TB drives that I used software to format. One of my Premieres is deactivated. The other has Lifetime. My plan is to just keep using the one with Lifetime and keep the one without service for parts. Since the unit I use is 6 years old, it is possible that the hard drive could fail. If it fails, I know I could just pop in the original 500-GB hard drive. Could I also just swap in the 3-TB hard drive from the deactivated (no service) Premiere and reset it? Or to use a drive that was installed in another TiVo unit, does one have to first reformat that drive? If I would have to reformat, I'd have to find the software again and also find suitable hardware. If the drives are easily swappable, then it's probably quite useful for me to keep the deactivated Premiere. If not, I could consider trying to sell the hardware (if there's a market for that).