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Mount a volume that’s been ejected using Disk Utility on Mac
If you eject a volume, you can use Disk Utility to mount the volume so that it’s available in the Finder.
In the Disk Utility app
on your Mac, select the volume in the list at the left, then click the Mount button 
.
You can also make an external volume available by disconnecting the external device from your Mac, then reconnecting it.