I have had two of these drives in the MythTV box for the past while. One of them had been acting up of late, and judging from the system logs it has actually been acting up since last November.

Nothing of note in the S.M.A.R.T. data -- something I have noticed that Seagate was doing with the 4TB drives too: don't log anything that might cause a customer to return a drive under warranty. Or something like that.

I checked the S.M.A.R.T. data on this drive as recently as last week -- 100% "error free", indicating to me that perhaps it was a cabling issue or something instead.

Ha. Dead drive today. Totally. Spins up, but won't talk to any system I connect it to. This was the newer of the two drives.

Edit: I will pick up a WD80EFZX (Western Digital Red 8TB drive) to replace it with on Saturday, then RMA the dead one.