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Old 06-29-2012, 03:52 PM   #1
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Cannot eject "device" Not authorized

Hello Linux Forums. I am having a rather silly problem. I am running Arch linux. When I plugin my flash drives they are detected and I can read their contents without any problems. The trouble is that I can't safely eject them. When I right click then eject it says: Cannot eject "device" Not authorized to perform operation. I have tried many things such as umount and eject. My device is /dev/sdb1. When I run umount it seems to work. In thunar it shows that I can mount the flashdrive because it is unmounted. Yet the flashdrive light is still on and when I click on it it automatically remounts. Is there any good way to safely remove drive from the CLI? And why can't I eject it from thunar? Google is not yielding any results.
Old 06-29-2012, 09:15 PM   #2
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see your distro guides

Actually all that depends on udev rules.

you can always umount from bash (as superuser if reqd)

dolphin konqueror
Old 06-29-2012, 09:23 PM   #3
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To build on what amani said, it may be a permissions problem. It's possible that the drives are being mounted as belonging to "root"; it that's the case, user cannot unmount them, only root can.

If you wish to investigate this more deeply, after mounting the drive, run in a terminal the command

cat /etc/mtab.
This article explains how to interpret mtab and fstab:


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