As a test, try this. Start watching any program on your HD DVR, then his pause. Now simply enter a channel number and watch something else. If within the time buffer of the original program, you simply pause the 2nd program and press the "Prev" button, the original program will appear. Note that a safer way to wander about while saving the program you were watching is the press the R record button which will put the program on your list and will be permanently (until delete) on your hard drive.