USB-Device umount

[Bernd Kloss <B_Kloss@web.de>]

Trying to "REmove device savely" the following message appears:

Unfortunately, the device system:/media/sda1 (/dev/sda1) named '1.0G Removable Media' and currently mounted at /media/disk could not be unmounted. Unmounting failed due to the following error:
Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
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:         root          1 ....m init
                     root       2097 ....m udevd
                     root       3765 ....m pppd
                     daemon     3788 ....m portmap
                     root       4085 ....m syslogd
                     root       4099 ....m klogd
                     root       4278 ....m acpid
                     root       4296 ....m cupsd
                     messagebus   4304 ....m dbus-daemon
                     haldaemon   4312 ....m hald
...
What to do?
Greetings
Bernd
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