Hi all- I'm getting a new HR20 next week to supplement a failing HDTivo. I'm thinking of getting a 750GB (or 1TB) hard drive, possibly _internal_, to add to the capacity from the get go. I'm aware I would have to break the sticker for an internal drive. If I went the external route, I'm aware that would replace rather than add to the supplied internal drive. Does anyone have advice about the quietest drives out there? Thanks for your help.