You will need to edit yout /fstab file
Here is how I would do it
as root...$vi /etc/fstab
Now create a entry similar to the below.This assumes your device is named/recognized as /dev/sda1
/dev/sda /mnt/usb_drive vfat noauto,rw,kudzu 0 0
the /mnt/usb_drive can named whatever i.e /mnt/fooboo,
vfat depends on file type if you share the drive between windows and linux vfat is the way to go. Otherwise ext3 ,rfs etc.
Pm me if need be.