I guess Media Center uses a buffer for when you are watching live TV. So when you chose to record that program, it copied over what was in the buffer to have as much of the program as possible. In your case, it had the whole thing buffered. How long after you started watching did you decide to record it?
dunno what your asking here but vista has done that for me since day one. it has always added what was in the live TV buffer to the recording, if you hit the record button while watching the live tv feed.
Hell my crappy comcast HD DVR does the same thing.
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