I'm not big on saving electricity at all and I'm trying to decide whether to select Mac's ≪Put hard disks to sleep when possible≫.
What are the pros and cons of doing so?
Eg, can I expect the hardware to last longer by keeping the hard disks on 24/7?
(I'm using Macbookpro 2017 Sierra, but question is also interested in other (future) versions.)
(Separately, why is ≪..hard disks..≫ plural when there's only one?)