I've been with D for quite a long time. And I've had many dvrs and replacements. There is that one monumental task that I really hate. RESTORING ALL MY SERIES LINKS. That number is just under a 100 now and if a failure occured or I wanted to add a larger drive it's back to square one. Now I know that a lot of people rely on the usb for their AM 21. But I would love if there was a menu option for connecting a USB flash drive for continuos incremental backup and restore of the series links. The current method of restore doesn't allow for channel preference, repeats/new, off season etc. Sorry if this has previously been discussed.