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So I'm trying to safely remove this USB drive, because when I don't it does not work properly. When I go on Nautilus and try to eject it, I get this error message:

Error ejecting: eject exited with exit code 1: eject: unable to eject, last error: Invalid argument

And when I try to safely remove it via Nautilus or Disk Utility:

Error detaching: helper exited with exit code 1: Detaching device /dev/sdb
USB device: /sys/devices/pci0000:00/0000:00:12.0/usb3/3-1)
SYNCHRONIZE CACHE: FAILED: No such file or directory
(Continuing despite SYNCHRONIZE CACHE failure.)
STOP UNIT: FAILED: No such file or directory

Doing a file system check on Disk Utility returns File system is clean.. Trying to unmount it via terminal returns this:

~sudo eject /dev/sdb
eject: unable to eject, last error: Invalid argument

I've tried to unmount it on Windows (dual boot system), but I simply got an error message saying that it was unable to eject it. No programs running or anything.

  • Have you tried sudo umount /dev/sdb ? – douggro Dec 24 '13 at 14:20
  • Weird, I get umount: /dev/sdb: not mounted as result. And I'm sure the device is mounted. – Gus Dec 24 '13 at 15:08
  • Try ls /media and see if the drive shows there. If it does, sudo umount /media/drivename – douggro Dec 24 '13 at 15:13
  • That worked! But it can be removed without problems just by unmounting? Safely removing still does not work. – Gus Dec 24 '13 at 15:31
  • Once it's unmounted from /media you should be able to disconnect it from the computer without problem: the filesystem is unmounted at that point. – douggro Dec 24 '13 at 15:50
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So, the problem has been solved thanks to Douggro, who helped me in the comments. I'm just reposting his answer here to close the question.

Try ls /media and see if the drive shows there. If it does, sudo umount /media/drivename – douggro

  • 4
    what to do if it does not ? – d a i s y Feb 22 '16 at 3:57

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