I think it's 3 years. I'm personally still kind of surprised I had problems. And maybe I misdiagnosed. But I spent several nights pulling the system apart, replacing all the SATA cables, cleaning the whole machine out for dust while I was in there. But on startup it still wouldn't detect the Seagate drive and I could hear the drive still repetitively cycling. I am assuming failure.
I ordered a Kingston SSD and installed that, but its just 128GB and will just be where I keep OS and the programs I generally use. Right now I've got video and everything else sizeable on external drives. But I am probably going to order another Seagate internal drive or two, since coming in I had had good luck with that make.