Hard drives rarely fail on me, and when they do, they're Western Digital. Which is fine, because I understand that drives aren't made perfectly and stuff can happen in the design and manufacturing process. It doesn't bother me, because WD tends to offer a good warranty and good performance drives. I find if the drive lasts a year (of a lot of use, 24/7 machine) it will most likely outlive the warranty. I have a 40Gb IDE drive from 9 years ago and it still works great. It has something like 4 and 1/2 years of up time (as recorded by smart,) and the drive (for IDE) still works great, and you know what. That's a Western Digital too. WD has great support and great drives, and if you don't get a drive that is great, then their great support will replace it quickly. It doesn't usually take them more than a day to process the RMA once they get it and they send it back 2-day shipping. At least, that has been my experience.
All in all, at least when a WD drive fails, WD will cover it and I know it's going to take me no time to request the RMA and send it out.