Last few years I've gone with all enterprise grade stuff from eBay and have had only a couple of HD failures and both were 2TB drives so they were old. My latest build is all SAS3 12G. 8 6TB. A mix of Seagate and Hitachi. I lucked out and got all low mileage drives so I expect this box to run 24/7 for many years without problems. But only time will tell.