bigmessowires said:

Could you take a photo? I don't think I've ever seen an "external disk drive icon". What happens if you boot an earlier system from the internal floppy, like System 6?

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That depends on the system it is on - if is on a Classic 9in B/W Mac, the icon I seen is the Mac icon with a little external drive next to it with an arrow pointing down the external drive. On the Mac IIcx/ci, I seen the Mac IIcx/ci with an external drive next to it with the arrow pointing down to the external drive.

This I seen on both System 6 & 7.