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Unfortunately, the device system:/media/sdb1 (/dev/sdb1) named '80G Media' and currently mounted at /media/disk could not be unmounted. 
Unmounting failed due to the following error:
Device is Busy:
Moreover, programs still using the device have been detected. They are listed below. You have to close them or change their working directory before attempting to unmount the device again.
                     USER        PID ACCESS COMMAND
/media/disk:         tdn       15021 f.... dbus-launch
                     tdn       15022 f.... dbus-daemon