I've been building my own computers since 1992 and in my experience, the main reasons harddrives fail are:
1. Static electricity when installed
2. Poor cooling
3. No grounding
I've had very few harddrives fail since I consider these points with all computers I build. I still got most of the drives I've used since 1994 and they are all working, some got a couple of bad sectors, but that's it.
These days I don't think it matters that much what disks you buy, but if you have really important stuff on the disks I would use different disk brands for each RAID 10 mirror, and if possible different batches for each disk.
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Alea iacta est
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