Once it’s mounted, you’ll be able to erase it. The solution to this one is simple, just choose the disk in Disk Utility’s sidebar and click Mount in the toolbar. If a disk is connected to your Mac but not mounted in the Finder, Disk Utility won’t be able to erase it. If the disk you’re trying to erase is badly damaged, Disk Utility may not be able to access the information needed to erase it. If you want to erase your startup disk, you’ll need to either boot in Recovery mode or boot from an external USB disk or USB stick.
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