Nearly all WD Reds now.
I started building my NAS with 6x 3TB Seagates and regretted it... 2 failed just after the 1 year warranty finished, another one within the next 6 months and another 6 months after that... 4 drives down in 2 years!
All my WD Reds are still going strong.
The remaining Seagates are still in use, but they're in backed up arrays.
I see. Sounds like I made right choice then. I could have saved £100 getting the Seagate's but buy cheap, buy twice as they say. Especially as they were probably close to or end of their warranty, plus they are drives I'd considering using more for computer storage rather than in a NAS or server.