I have a 100mb parallel port zip disk on a Debian 2.2.17 system (Libranet distribution) and I cannot get it to work, I installed the low level SCSI drivers for both old and new, and when I restarted into KDE went into a terminal window and typed:
depmod -a
modprobe imm
I got this result:
/lib/modules/2.2.17/SCSI/imm.o: init_module: device or resource busy
/lib/modules/2.2.17/SCSI/imm.o: insmod /lib/modules /2.2.17/SCSI/imm.o failed
/lib/modules/2.2.17/SCSI/imm.o: insmod imm failed

I know all the cables are hooked up ok because the printer works fine (note: I configured the printer after I tried the zip drive)

HELP

(FOR DEBIAN BASED SYSTEMS)

1. use printtool and remove all printers (for now)
2. as root:
(make sure you install the drivers with your kernel as modules- by recompiling your kerne)
depmod -a
modprobe (either: imm or ppa)-depends if it is a new zip drive or old one-if one doesn't work try the other
then in edit /etc/fstab and add:
/dev/sda /zip /vfat no auto,fw,user,nosuid,sync,mode=0777

then mkdir /zip
then mount /zip
then ls /zip should show you everything on that zip drive
unmount /zip when you are done
3. reinstall your printer