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| ==trouble unmounting a USB disk==
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| Sometimes a user has cd'ed to a USB disk in some window (shell)
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| and then if someone else tries
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| to unmount the disk they will get a message like this:
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| umount: /media/120514a: umount failed: Operation not permitted
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| The solution is to find the offending process and kill it ''cold''.
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| If the disk is labeled '120514a', then the steps are:
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| lsof | grep 120514a
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| you might see something like this
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| bash 8367 dgs cwd DIR 8,49 20480 61341743 /media/120514a/user/cs
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| you can now kill this offending process as
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| kill -9 8367
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| and then you can do
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| umount /media/120514a
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