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MareLuce

macrumors 65816
Original poster
Right now I'm formatting a Seagate external drive in the format that the MacOS said it needs for a Time Machine backup.

I'm doing a Time Machine backup in preparation for upgrading to High Sierra from Sierra. I chose the secure erase option so it will take a while.

Will disk formatting continue after I close the screen?
 
Thank you so much Gimnet1 !

I just checked

"Prevent computer from sleeping automatically when display is off"
"Enable PowerNap when plugged into a power adapter"

and unchecked

"Put hard disks to sleep when possible"

in Energy Saver setting
 
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