I cannot explain this one.
I haven't been on my DVR much, lately, but when I went to watch a recording of Riduculousness, last week, I noticed that there were about 100 unwatched episodes missing. I didn't have much time to look then, but I am looking now and I see many of my passes have missing episode or all the episodes are completely gone...example, I had 20+ episodes of NCIS and 15+ episodes of Alaska: The Last Frontier...now neither of them have any episodes in the folder.
Last I checked, I had used about 30% of the space on a 4TB drive. Now it shows I have only used 2.9%...so, I have lost 90% of my recordings.
How does this happen?