Have an external Hard Drive USB2 --only 40G, but intended for Text.

Want to be able to use it as "go-between" Computers to create Back-Up files across several Computers. Also, leave files from several Computers in one place as a Centralized source that is easy to use and kept off-site. Remember these are text files, so 40G is not all that skimpy.

QUESTION: Can the External USB2Hard Drive be kept as one Big Extended Drive with multiple Folders for each Computer, with sub-Folders for each type of Doc. ?

Or is some other form of organization preferable or required?
(For example, does it need a primary but inactive (?) partition?)

I would prefer not to impact on the Drive Lettering of any Computer it visits.

ThanX,

DOOOG