I just recently bought a 40-hour series 2 (Obviously I'm going to upgrade!!) but I was just wondering how large the hard drive is in the 40 hour and how large of a hard drive I would be allowed to replace it with. I read somewhere that 137 gb is the most a TIVO will read (I don't want to put in TWO hdd's). Is there anyway to bypass that? And, how many hours would I be able to record on a 137gb hdd? Thanks Folks! PS - Is there a way I can transfer my recordings form my Tivo Box to my computer so i can burn them?