It's a "My Book" External hard drive by Western Digital, 320GB. It's designed to look like a book that you would stack vertically, like on a book shelf, but in our set up, it would work better on its side under the monitor stand. Documentation doesn't say address this issue, and so far no responses from the support staff. (They must be on vacation with the rest of the world except us!)
Anybody out there using one of these and laying it on its side?