dear friend:
I have an external floppy drive, pc1, that reads pc disks on top of amiga disks. For my amiga 1200.
After you connect the external drive (make sure is connected to -disk drive- and not -parallel-) you also need to -mount-the external drive -df1-. to mount it..you need to go to workbench..and from the drawer -i think is expansion, but don't remember-take the -df1- icon and copy paste into the mounted drawer. Basically..move the df1 icon from a drawer to the next, and this will mount the external drive into workbench. Is easy..then it will work.
cheers!!!
rednova