How do you view file on an external drive using Unix?

Hi Folks,
I'm a serious UNIX newbie...Basically I took up unix in order to use a specific image processing software package... I've learned enough to write a script to batch process all of my images, but I have so many that I would like to use an external (USB) drive to hold the data and point the script towards those files.
Is there any way to navigate to an external drive in UNIX?
I see a lot about "mounting" drives, but I have no idea how to do this... I really need someone to hold my hand!
Thanks.
-Brent.

PS:
here is an example of mounting a network drive if you have to go across the network and actually have the external drive mounted, as opposed to just copying to/from (which would probably be the case coz' things like "scp" are going to ask you for a password):
mount -t smb server.work.com:/vol/vol0/Projects /Projects
-t is keyword for type of of filesystem and smb is the actual type.
server.work.com:/vol/vol0/Projects is path to actual directory on external networked drive. The trailing "/Projects" is the mount point and name on your computer.
Visit the "man" pages for mount in Terminal for more info, at prompt, type
man mount
You won't have to bother with this with a locally mounted (i.e., on the same computer that you are working on) firewire or USB drive. The local path is just
/Volumes/{NameOfExternalFirewireOrUSBdrive}/{filepath}

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