This may be an issue of using System Utilities version 2.1.1 on an Apple IIc Plus. However, what happens is that it thinks that the internal 3.5" drive is the first external one!
For example, I pick choice 7 from the menu: Identify and Catalog a Disk. It asks me: Where is your disk? The first choice is BUILT-IN DRIVE, but that looks to the attached 5 1/4" external drive. If it's not attached, it balks, not finding the disk or drive. I have to select choice #2: EXTERNAL 3.5" DRIVE for it to read the internal drive!
Is there a simple way of fixing that, especially permanently?
Or, is that just the way this works?