My first DVR was a TiVo S1, which I bought in 2000. My first HD DVR was a Scientific Atlanta SA8000HD, which Cox OKC first made available in 2004. Later, Cox upgraded those to the 8300HD model. I still have one of them on my other HDTV but hate to use it because its SARA software is so awful. Anyway, until recently, I had no idea that the S3 would retain an already accumulated buffer, despite recordings having started on both tuners.