External hard drives don’t show up in MacOS Sierra [Fix]

How to fix if the drives (External Hard Drive) do not show up under MacOS Sierra when plugged in?

That perform SMC reset will solve the problem. 

In a simple case that the drive is mounted and appear in the left-side bar from Finder window, but the volumes do not show up anywhere on the desktop screen, just go to “Finder Preference” (Finder > Preferences > General), un-check then check on “External disks” options.

show up drive Macos Sierra

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