A friend forgot to record a show he really wanted to see and I have it on my DVR. Can I save that recording to a memory stick so he can watch it on his computer?
No its not possible.
There is a trick, with a Pace PVR and an expander of some kind, to get the recordings off and onto your computer, but that is it. It may or may not still work, I know it used to anyways.
You can't transfer the expander to another PVR and have the recordings either.
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