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I have a few external drives, some using external power, other being USB powered.

I plug my USB 3.0 drive in a USB 3.0 port.
When I "eject" the drive (from Nautilus) it keeps on spinning.
When I "remove safely" the drive, its name disappears from Nautilus, but the drive keeps spinning. I don't see the point.
I need to physically unplug the USB cable to stop it.

How can I make a drive stop spinning when ejected?

Now, something weird is happening, that might help :
If I plug this same USB 3.0 drive in a USB 2.0 port, it will properly shutdown and stop spinning when I "remove safely" the drive.

Then when I plug it back to the usb 3.0 port, and try to "remove safely", it will... remount automatically! This is really weird, I don't get it.

Last thing I noticed is that the command udisks --detach /dev/sdb does the trick. Why would "remove safely" not do it?

  • hdparm can spin down / sleep internal HD's, might work here too – Xen2050 Dec 30 '14 at 13:58
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AFAIK, "Remove safely" just unmounts the device, and removes it from udev. It doesn't send any command to the drive to shut down.

On the contrary, udisks --detatch does so: (udisks manpage)

--detach device_file [--detach-options options]
       Detaches (e.g. powering down the physical port the device is
       connected to) the device represented by device_file using a
       comma-separated list of options.
  • 1
    Remove safely/safely remove drive should spin down the drive (does with USB 2.0 external) – Wilf Jan 1 '15 at 19:49

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