Re:Backblaze Hard Drive Stats for 2016
by Already__Taken on Wednesday February 01, 2017 @04:16AM
(#13539450)
There should be no wear at all once it's running, read: https://en.wikipedia.org/wiki/Air_bearing
So barring any manufacturing defects that I'm soure would be abundantly clear early on, it's down to logic or electrical failures.
I think having the drives spin constantly is the best for lifespan, because there are less spinups and thus components wear less.