Why is my system hanging at 'Unmounting Filesystems' whenever I try to shut it down or reboot it?

Updated -

Release Found: Red Hat Enterprise Linux 2.1 Update 4 and lower

Symptom: The system hangs at "Unmounting Filesystems" whenever any attempt is made to shutdown or reboot. The shutdown or reboot never completes.

Solution:

Check and make sure you do not have any USB-storage devices (USB CD-ROMs, floppies, or USB keys) mounted ...

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