Using a USB storage device requires that your kernel have the following compiled as modules (or internal to the kernel):
These devices also use SCSI, so remember to make sure your kernel supports SCSI generic and SCSI disk. Once you have a suitable kernel, proceed.
You must determine which adapter driver to use. Generally, an Intel or Via motherboard will need usb-ohci.o; motherboards by Compaq, OPTi, SiS, and ALI need uhci.o (so do iMacs). To ensure you have the correct apadter, examine /proc/pci like so:
cat /proc/pci|grep -i usb
To get the device working:
echo "/dev/sda4 /mnt/usb vfat noauto,user 0 0" >> /etc/fstab
mkdir -p /mnt/usb
For further info about USB under Linux, visit www.linux-usb.org*