you can also setup sudo to allow the user to mount that drive.
as root run visudo and find your user account name. if it is not here add it and make it look something like the following:
user ALL =(root) NOPASSWD: /bin/dmesg -n 1, /usr/rx30/setroute.pl, /usr/bin/copyconfig.sh, /bin/mount -t iso9660 /dev/dvd /mnt/dvd, /bin/umount /dev/dvd, /usr/bin/runit.sh, /usr/bin/dvd+rw-format -force /dev/dvd, /b
in/mount /dev/dvd /mnt/dvd, /bin/mount -t iso9660 /dev/cdrom /mnt/cdrom, /bin/umount /mnt/cdrom, /usr/bin/eject, /usr/bin/eject -t, /usr/bin/fixprinter, /bin/cp, /bin/chmod, /bin/chown, /bin/mount /mnt/backup, /bin/umo
unt /mnt/backup , /bin/mount /mnt/usb, /bin/umount /mnt/usb, /tmp/formatDev.sh, /bin/mount /mnt/cifs, /bin/umount /mnt/cifs
Note the bold
section is the how that user will access the drive.
so as user you would type:
$ sudo /bin/mount /mnt/usb