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I'm running OSX 10.10 Yosemite. When I try to shut it down, if I have an external drive connected the shutdown stalls on a black screen with the mouse pointer visible, and movable.

This happens even if no applications are running when I shut down, so it doesn't appear to be the case that OSX can't unmount the external drive.

One solution that came to mind would be to write a bash script that would unmount all external drives, and to run that script on shutdown. Is this a sensible solution? How do you run a script on shutdown?

  • Easiest way is to write a script that serves as a logout hook – BallpointBen Jun 1 '18 at 6:03
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There are few apps that can eject the external drive as described here:

Automatically eject external disks on sleep and reconnect after on OS X

Jettison app $4.99

autoEJECT app $4.99

just to name 2.

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