One of the 2TB Seagate 64 MB Cache 7200 RPM STBD2000101 I purchased 26 months ago started acting weird.
It failed the Smart test. Replaced it with new of same model. Gparted is the best. Working great, then AM21N stopped receiving Off-Air, replaced it with new .
I assume it is to be expected, hard drives wear out.
All three receivers are on UPS battery backups.
to know a health of your drive(s) use PC with SATA port and run MHDD/Victoria (I'm asking/offer this so many times... man !)