I have only had the free refurbished HR-21 for about 1 week and it died. Yesterday morning I tried to turn it on and it said doing a disk scan. It took all day. Last night it tried for several hours to run receiver self check. It was stuck in a loop. I unplugged for over nite. Checked today and same thing. Called Directv and they said prob HDD is shot. Said they are shipping me another NEW HDDVR. I can't be choosy when it's free but I hope it's a HR-24. ?