Mac OS X doesn't detect zip 100 USB drive

Hi, would anyone be able to help me? I am trying to use a Zip 100 portable USB drive with my Mac OSX 10.3.9 and when I try to install with the install cd, it states "classic cannot find a mac OS 9 system folder on the start up disk to use. You may need to install MAC OS 9.1 or later on your computer" the Iomega site makes it seem like this version of Mac doesn't even need the install disk (it should automatically be detected on the desktop) but it doesn't seem to be detected, at least I can't find it anywhere. Any help would really be appreciated! thanks :) Melissa