After I got it up and running, I connected the My Book AV DVR Expander 1TB and restarted the box (twice). It keeps telling me the drive is unsupported after I agree to allow it to set it up for storage.
Connected to basic Roamio via eSata.
Also seems to be stuck on "Getting info (Downloading...)"
Edit: Finally made it thru download (on wifi with 85% signal).