I've just upgraded from High Sierra to Mojave. I have a Lacie Porsche USB-C drive that I use for Time Machine backups. In High Sierra when I ejected the drive, it would power off and I could safely unplug it. However, now it doesn't spin down and I can't safely unplug. All I can do is put my Mac to sleep which in turn powers down the drive.

I have tried excluding the drive from Spotlight indexing and even disabling indexing altogether but this hasn't helped.

Anyone else having this problem or have a solution?

  • try this in Terminal to find out who is using it lsof | grep DODO – Ruskes Sep 30 '18 at 21:02
  • so nobody is using it ! – Ruskes Sep 30 '18 at 21:08
  • If the drive is unmounted you can safely unplug it, regardless of the power status. USB is completely hotplug compatible. – Steve Chambers Sep 30 '18 at 21:12
  • Thanks for the comments. Although it seems like the drive is unmounted, it stills sounds like it is active and makes a nasty screeching sound if I just unplug it. This didn't happen before I upgraded to Mojave. – Alan Spark Oct 1 '18 at 18:36
  • Just a quick update on this. The problem seems to have resolved itself... – Alan Spark Oct 13 '18 at 8:48

Use this Terminal command sudo lsof | grep DODO

to find out who is using the USB.

Wait for it to respond, it might take 10 seconds.

If no one is using it, it is safe to eject the disk (pull out).

I did not answer your question "Why it does not Power Down" ? I do not know, probably missing the handshake saying I am done.

  • Doesn't that need a sudo? – user151019 Sep 30 '18 at 21:17
  • @Mark not on my Mac, and since it is only read command why would it need sudo ? – Ruskes Sep 30 '18 at 21:19
  • Because lsof on its own won't show files open by root and other users ss64.com/osx/lsof.html – user151019 Oct 12 '18 at 11:35
  • Thanks for the answer. I am not sure what the problem was but it has resolved itself... – Alan Spark Oct 13 '18 at 8:49
  • What is "DODO"? – Szabolcs May 31 at 13:10

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