MacBook retina cannot find the USB hard drive when it is plugged again

Hello world

I have a MacBook retina 2015 computers and a hard drive WD elements USB3 that I use as a Time Machine backup when they travel. The drive is plugged into the USB - C through one of the Apple dongles and when I first start the computer, the USB is mounted and that it appears on the desktop. He does everything very well.

When I want to take the machine away, I eject it, wait for the secure message and then physically disconnect the drive. However, when I go back and reconnect the drive, the Mac did not see it. The reader will be able as the light comes on and I can hear it turn. Just, it is not mount and is completely invisible for MacOS.

I checked all connections, even used another dongle - no luck. A disconnect does not set, and I tried to reset the NVRAM. So far, the only solution is to reboot the Mac, afterwards the player reappears - at least until I need to unplug it again.

Anyone got any ideas what is underway and if there is a fix?

Thank you very much

Mike.

Hello, Mike Richards2,.

Thank you for using communities Support from Apple!

This is I think understand that you are not able to see an external hard drive when it is ejected, and then reconnect the computer.  I have some suggestions that I hope will help you.

It is important to try to isolate what is responsible for this.  The first thing to do to help isolate what is causing the problem is to start the computer in what is called Safe Mode and see if the problem persists.

Start in safe mode:

  1. Choose the Apple menu > shut down.
  2. After your Mac stops, wait 10 seconds, then press the power button.
  3. As soon as you hear the startup tone, hold down the SHIFT key.
    You must press the SHIFT key as soon as possible once you hear the startup tone, but not before.
  4. Release the SHIFT key when you see the gray Apple logo and progress indicator.

OS X El Capitan: start in safe mode

Once the computer is running in safe mode, see if you can duplicate the issue.  If the problem does not appear, go ahead and try to reboot normally again.  If the problem has disappeared, it may have been caused by a problem of file or directory of cache fixed by booting in safe mode.

If the question comes up, you'll want to check the login items.  Follow these instructions to remove the connection:

OS X El Capitan: If you think you have incompatible connection points

Remove the connection, restart the computer and see if the problem persists.

Have a great day!

Tags: Notebooks

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