Linux sees USB storage as SCSI. Do this and you should be OK.
As root type....
tail -f /var/log/messages
Now turn your digital camera / handydrive or whatever into the USB port. Look for something like the following (this is what I get when I plug my USB dig camera in.
Apr 29 16:39:13 CHAPSD kernel: SCSI device sdb: 253696 512-byte hdwr sectors (130 MB)
Apr 29 16:39:13 CHAPSD kernel: sdb: Write Protect is off
Apr 29 16:39:13 CHAPSD kernel: sdb: sdb1
You can see there that the kernel detected what you plugged in, and tells you what device to use for it. Now you have this info, you can do this....
mount /dev/sdb1 /mnt/digcam
You don't have to mount it to digcam of course, you can mount it to what ever directory you want, also don't just use the above example, do it your self as yours may be different.
To umount it, just do....
Hope this helps.