I have two HR21 receivers that I upgraded to SSD drives 256 gig ones. I did this so I can take the fan out and have it silent since both are in bedrooms. Well last week, I got a message saying that the Direct TV unit was BELOW operating temperature. I take it since directv uses the temp sensor in the hard drive, and there isn't one in my Crucial SSD drive, it could not pick it up so it assumed it was 32 degrees. Anyway - I replaced the drives with regular ones and it works, but the sound is driving me nuts (I like quiet at night). Anyone know how to get around this?