This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
I had many problems when I first started with the Iomega Zip on my GS and it isn't the most reliable thing - But it works. 1.) Make sure that the Zipdrive is hooked directly to your HS Apple SCSI card. 2.) Chain your Zipdrive to the external HD which you will be using. 3.) Attach a terminator adapter to the back of the remaining port on your external HD - The Zipdrive has a weak termination and requires another terminator source. As for getting your GS to recognize the Zipdrive in all applications: 1.) Turn on your Zipdrive 2.) Turn on your external HD 3.) Turn on the GS 4.) Put the Zipdisk in the drive before GSOS is booted so that it may be scanned and recognized. Last, if you are working on the GS for a long time and suddenly the Zipdrive Icons don't pop up when you load Finder, simply eject the zipdisk and push it back into the drive. By: Sloopy Malibu