"With this information, does that mean that if I allow my users into these groups, they will be able to use these disks?"
Yes.
"what device files are linked to the serial and usb ports?"
The serial devices are /dev/ttyS*
(note that is a capital S, small s is something different)
The USB devices are /dev/usb/*
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Be prepared. Create a LifeBoat CD.
http://users.rcn.com/srstites/LifeBo...home.page.html
Steve Stites