I didn't notice this until recently, but when you are watching a recorded program, the buffer on whatever channel the live tuner is on (OTA or satellite) is not active. I may put the OTA tuner on Jeopardy @ 7:30pm and watch a 20 minute recorded program. After the recorded program is over (say, at 7:50pm), I delete it and then go back to the live tuner and try to rewind it to 7:30pm to start watching Jeopardy from the beginning. The buffer starts, however, when I stopped watching the recorded program, in other words, only live TV. No buffer from the past 90 or 30 minutes even though the tuner has been on this channel for more than 30 minutes. Why do the HR20 tuners (OTA or satellite) not buffer whatever is on the live tuner when watching a recorded program? This seems to me to be a basic DVR function for a single live buffer. My Tivo unit does this. What gives?!?