We have well over 150 3TB Seagate Barracuda's at work that are halfway into their second year of operation.
The first year has been pretty flawless, maybe 1 failure, but the second year, we've had about 15 already get peppered with bad sectors and its continuing to happen at least once per week or so on more drives.
This hands a lot of crediblity to Backblazes findings if you ask me. Again these are modern 3TB Barracuda's, (non-XT)
I was sad when they discontued the XT line, simply because we have about 30 of the XT 2TB models into their 3rd year and no failures yet.
Oh, right, they didn't discontinue the XT at all, rather turned it into the Constellation series and sold it for double the price!