Originally posted by |2ainman
not sure but doesnt the user need execute permissions on the scanner? I dont think they need write permission, seeing as its a reading device. U might just want to give it 755 instead, although you'd think that 6(read/write) would be enough ...
yeah. you need permissions to mount and unmount the scanner.
go into your /etc/fstab as root and change the mount options, and change the mount settings of /dev/usb/scanner0 to user. That'll make everybody on the system to mount and unmount (enable and disable) your scanner.