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External hard disks and pen drives connected via USB no longer show up in Finder.

What could be the possible reason, and how do I resolve this issue?

  • Does it appear in disk utility? – JBis Aug 2 '18 at 11:40
  • Go to Finder and press the keyboard shortcut: Cmd + Shift + c. Check if your drive(s) are visible. – Nimesh Neema Aug 2 '18 at 11:41
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    Strong guess here: you mean "do not show up on the desktop"? Or nowhere in Finder (windows) as well? Please clarify this. – LаngLаngС Aug 2 '18 at 12:17
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I have had this issue, on my 2017 MacBook Pro (2 USB-C ports) - and I found that the problem is resolved by resetting the Mac's System Management Controller (SMC).

Power your machine down, wait a couple of seconds - then press the left-hand side Shift-Control-Option at the same time, as well as the power button, for 10 seconds (I count slowly, so more likely 15 seconds when I do it). Release the keys and then power your machine back on.

Hopefully it will now register the external drives.

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Tries

Have you tried to:

  1. Relaunch Finder
  2. Reboot your Mac
  3. Safe boot followed by a reboot or a shutdown
  4. Try all of your other ports of your computer

Does your Hard Drive and USB drive work on another Windows and Mac computers? Perhaps your ports are broken

Terminal

Try to run these command from Terminal to see if the operating system is able to see your drives:

Launch Terminal.app and run the following:

cd /Volumes
ls

Try to see if you see your drives here.

If you do see them, then run:

diskutil info "disc#"

then

diskutil eject "disc#"

Then run list again. When sure it's removed, then physically remove, wait a few seconds and reinstall.

Spotlight

If the issue isn't resolved yet, launch Console.app Then open and go to the Errors tab, plug your drive in and see if there's any red tags popping up which could help you track down the problem.

Last try

Try visiting an Apple Store and seek assistance with a Genius, if none of the previous approaches worked.

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