> FDUNIT and FDTYPE both derive from minor(dev).
Yes.

> MAKEDEV creates 16 minors, so you get unit 0 and 1, and 8 types each.
I get sixteen fd0x and sixteen fd1x entries. Is my MAKEDEV broken?

> What is FDUNIT good for?
Well, ehm, I suppose that's supposed to be, ehm, the unit number, e.g. 0 or 1 
for fd0x/fd1x.

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