I have never had a drive fail on any PC I've ever owned. That goes back to the dawn of PC time. At work, however, I've seen many a drive fail. Most of them Seagate or WD, but then they are the biggest sellers, so I'd expect that. Also, more failures in business PC because of inferior components, too small power supplies, minimal or non-existant cooling to say nothing about being placed on the floor (dusty place) and left on for years.
Rig 2: P-35, E6750 @ 3.6 GHz, Geil PC-8500, 4850, water
Rig 3: P-45, E8400 @ 3.6 GHz, Corsair PC-6400, 2 X GTX 460, air
Rig 4: Z77, i3-3225 @ 3.6 GHz, Gskill Ripjaws-X, HD7850, air