Anything can fail, but here's my example - 2 HDD WD server "golden series" (4 terabytes each) have been working for me almost around the clock since 2013, downloading and distributing torrents, i.e. this load is very decent. The noise doesn't bother me, the temperature (this is normal) is 45-50 degrees Celsius). These drives don't work as external drives, I just bought a very spacious case with a good cooling system for them.It's also important to understand that there are no guarantees with HDD reliability, a WD Gold enterprise class HDD might die in a couple months while a Seagate Barracuda consumer drive might live for a decade. At large sample sizes the enterprise server and NAS drives will come out with better numbers, and when purchasing an individual drive your odds will be better with a drive built for heavy usage, but the edge is smaller than you might expect unless you'll be running the drive(s) hard and those drives intended for server racks tend to be louder and run hotter than less performant drives intended for consumer use.
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