Try this, create two aliases on your .bashrc:
alias gumount='gnome-mount -u -d /dev/sda1'
alias gmount='gnome-mount -d /dev/sda1'
Just replace /dev/sda1 with teh /dev/whatever your system uses for the usb pen drive. Log off and back on and you'll have it!
Regards,
Linux user number 433512
Free as in Freedom:
http://counter.li.org
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