I have experience upgrading series 2 Tivos, but not Premieres. I understand the upgrade process though, I think. Are there only specific hard drives that can be used, other than being SATA? Is there limit on the size drive? I see 2TB used, but can I use a 3TB drive? OK. So I read in the upgrade thread that Tivo can't use the 3TB drive. Any way to condense that thread? 56 pages is too long.