How to Find a Flash Drive That’s Not Showing up On a Mac? Solutions for Mac’s Finder’s Invisible Drives
Once you connect an external hard drive to your Mac through USB, the device should display in the Finder (aka mount on the desktop). It’s also in the left-hand column of the Finder, under “Locations” (or Devices on older versions of macOS). Your disc may not have been formatted properly, be corrupted, or be broken…