hi there.
i use parallel-port zip drive, so assuming u are using the same, this is what i did.
1. you have to load modules (that support the zip drive).
for older zip drive - modprobe ppa
for newer zip drive - modprobe imm
if it works, u'll get back a prompt.. if not,then there'll be lotsa error msg.
try to use insmod(install module) instead of modprobe.
* btw, u have to running as root
2. make the mount point.
mkdir /mnt/zip
3. mount the zip drive into the directory.
mount -t vfat /dev/sda4 /mnt/zip
4. when u want to remove the disk,make sure to unmount it first.
i didn't get them all smooth n running the 1st few time (especially when loading module), so if this method don't work, try google around for other tips too..

. if i remembered, there's a manual page in iomega website too.