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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?

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  • try this in Terminal to find out who is using it lsof | grep DODO
    – Ruskes
    Commented Sep 30, 2018 at 21:02
  • so nobody is using it !
    – Ruskes
    Commented Sep 30, 2018 at 21:08
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    If the drive is unmounted you can safely unplug it, regardless of the power status. USB is completely hotplug compatible.
    – Steve Chambers
    Commented Sep 30, 2018 at 21:12
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    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
    Commented Oct 1, 2018 at 18:36
  • Just a quick update on this. The problem seems to have resolved itself...
    – Alan Spark
    Commented Oct 13, 2018 at 8:48

1 Answer 1

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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.

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5
  • Doesn't that need a sudo?
    – mmmmmm
    Commented Sep 30, 2018 at 21:17
  • @Mark not on my Mac, and since it is only read command why would it need sudo ?
    – Ruskes
    Commented Sep 30, 2018 at 21:19
  • Because lsof on its own won't show files open by root and other users ss64.com/osx/lsof.html
    – mmmmmm
    Commented Oct 12, 2018 at 11:35
  • Thanks for the answer. I am not sure what the problem was but it has resolved itself...
    – Alan Spark
    Commented Oct 13, 2018 at 8:49
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    What is "DODO"?
    – Szabolcs
    Commented May 31, 2019 at 13:10

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