said by curtis33 
:"You can have a DVR. Just not one that lets you record one show while watching another. In other words, you can single tuner your DVR action all you want. Just don't try to watch while recording."
Most DVRs can't display a direct picture. Everything you see comes off the hard drive. That's how you can pause and rewind the live picture. In other words, there is always recording going on even if you are just watching a "live" picture.
I'd be surprised if this were true. I've had a hard drive completely crash and I was still able to watch live TV until the DVR was replaced. There aren't really that many different types of DVR's out there, this was a Scientific Atlanta with Comcast.
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