Seagate HDD failure rates: >25% over 3 years (article)
Far from conclusive, but from a decent sample size and real-world production data: Hard drive reliability study names names - The Tech Report
This is my favourite graph of the (short) article:
Looks like I'll be avoiding Seagate then! I know this is one study on a small proportion of all the world's shipments on HDDs, but when there's often only pennies separating HDDs, I'll not take the risk, thanks.