I'm trying to get four drives working with my IIgs. A friend of mine lent me a bunch of 3.5" drives, and I've got two 5.25" drives. No matter which of the 3.5" drives I use, I can never see the second 3.5" drive.

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You do need to have the 5.25" disks at the end of the chain, but you say you've tried just chaining the 3.5" drives together with no 5.25" drives at all. Hmmm. That should work. What are the model numbers of the 3.5" drives?

References here:

http://www.vintagemacworld.com/drives.html