My entire Mac GUI freezes for 1–3 seconds about once an hour. I finally correlated it to my external hard drive I use for TimeMachine backups. It takes a second or two to spin up, and in that time the Mac becomes non-responsive.
Fucking ridiculous.
2 thoughts on “MacOS freezes while waiting for hard drive”
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Nelson's log 
:( makes me happy (i guess) that our time machine backup is a NAS.
Yeah, cuz nothing ever goes wrong with a network attached filesystem :-) Also IIRC Apple only lets you back up to an Apple file server. I imagine most people just use Time Capsule, but… http://pondini.org/TM/2.html