I have an HR-21 with an external PureData eSata 1Tb drive. I got the external drive more than a month ago and generally it works fine. Today while tuned to the MLB HD Mix channel, the receiver started acting strangely -- I couldn't tune to another channel, and the guide would only appear halfway. Power off-on didn't help, so I decided to red-button-reset. When the receiver rebooted, I watched in horror as the screen said "Reformatting hard drive". When the reboot finished, sure enough, the external drive and all its programming and settings had been erased. What happened? What did I do wrong and how can I avoid it in the future? Thanks, S.