Am I missing something here? I just got an Elite, and it shows a capacity of 318 HD hrs, or 2774 SD hrs. I beilve it has a 2 TB hard drive. I keep seeing this ad from Tivo, that it has 1000 hrs. If they are talking about SD, why wouldn't they say 2700 hrs. If they are talking about HD hrs, why am I only getting 318 hrs?