Model 652; The HDD is constantly "thrashing" around. This has been going on for weeks now. I decided to do a power cycle which initially solved the problem, but only for a week. Now it's back to thrashing. I have a 2nd 652, but that is not doing this. This is setup for OTA & CATV w/ no CC if that matters. It also does not have any desktop functions (access) in use. It has a WD 1TB internal drive (WD10EVVS) with no external drive connected. This is not a noisy or bad hard drive. The thrashing is quite, it either has to be dead quiet in the room or I have to place my ear next to the deck to hear this. It sounds as it's doing a defrag process continuously or indexing (if that is what it is called). I used MFSLive boot CD to image the drive. Any ideas what is going on and why a power cycle temporally fixed the problem?