I think what you are looking for is the Iomega drivers : iodriver-mac-ppc-304.hqx

https://iomega-eu-en.custhelp.com/cgi-bin/iomega_eu_en.cfg/php/enduser/cust_alp.php?prod_lvl1=1&prod_lvl2=18&p_prods=1,18&cat_lvl1=75&p_cats=75&p_pv=2.18&p_cv=1.75&p_sid=4UUMwnDj

or here if you dont want to register

I hate recommending the crappy driver depositories but I did manage to download it from here

http://www.opendrivers.com/driver/217203/iomega-hard-drive-driver-v3.0.4-mac-os-8.6-9.1-free-download.html