Re:
Assuming that the FDC will work with two (I've never heard of an FDC that
won't?)
 
Some late-model Asus motherboards support only a single floppy drive,
period, no way around it.  An example is my Asus P4T533 ... one floppy
drive, neither hardware nor software support for a 2nd one.
Stupid.  Incredibly stupid, but that's what they did.