[zcaveman]

I use a splitter and run one line into the Comcast DVR and one line into the personal DVR. The cables out of the Comcast DVR (4 0f them) go into the TV and are assigned to Video4 The personal DVR goes into the coax of the TV at Video1.

This allows two things. I can watch the Comcast DVR channels in HD and record using the Comcast DVR and I can use my normal time recording on the personal DVR and record multiple channels during a recording session.