Had a bit of a scare with my AirTV setup today.
I used the Roku app to look at my recordings, and chose one to watch. When I selected it, there was a very long delay, followed by some kind of "timeout" error message accessing the AirTV. I pressed Exit, and it went back to the initial screen - but all my recordings were gone!
I exited the app and restarted, and this time it acted as if I'd never even set the AirTV up for recording! Not only were the recordings gone but the HDD was gone, and it didn't even say "USB disconnected!"
Starting to panic, I went to the AirTV, turned off the HDD enclosure, waited a few seconds, and turned it back on. Then I tried the Roku app again. Luckily, this time it worked. My recordings were back and this time I was able to watch the one I wanted to.
OK; so, if this happens to anyone else, that's the thing to try: exit the app, then turn off the HDD, give it a few seconds, and turn it back on. Then try the app again.
But the AirTV's DVR sure seems "brittle" - easily broken by nothing in particular. I've been using it as a tertiary backup, in case a DTVPal and DVR+ both fail (believe it or not, that has happened at least once), but I don't yet feel confident enough to move it up to primary or even secondary status.
The AirTV's a nice device, Echostar, but you still need to work on it. Folks aren't gonna be happy with a DVR that appears to lose all their recordings if some obscure error happens.