A little background first. 3-4 times since September when I have tried to watch survivor I have had stuttering picture and video. The DVR is also very slow to respond to remote in this case. In all the cases I was able to wait until Survivor was over and then reboot. After reboot the show played fine, it seems the recording was fine but the DVR was just having playback / real time issues. A little over a week ago I swapped my external 1 TB drive for a 1.5 TB drive, and transferred all the shows in the process. Both drives used the same Antec MX-1 case and appeared to be working fine before and after the swap. Tonight I attempted to watch survivor again and again the picture and sound was stuttering. The DVR was recording Survivor as well as My Name is Earl. When I looked the play list it showed two copies of Survivor being recorded at once. I waited until Earl was done and then rebooted the DVR using the menu. Once the DVR rebooted My Play List was totally blank. I thought possibly the DVR had booted of the internal drive and so I rebooted again and checked all connections. Same result. Next I started a recording of the Office so I would have something on play list. Rebooted again and pulled the eSATA this time. It booted up with a blank play list again. This time I started a recording of 30 Rock. Then I rebooted once more and reattached eSATA, the Office was on the play list and 30 rock wasn't. This confirmed it was using external drive. It appears the HR21-100 just decided to reformat my eSATA drive. Which in short really freaking blows. The drive was 50% full so you can only imagine how much I have now lost. What went wrong? What did I do wrong? P.S. My fiancé asked why we use these DVR’s; I honestly didn't have a good answer other than it was all that was offered by DirecTV now. I may just have to setup my TiVo Series 3 as a backup.