The easiest way is to just pull the bad floppy and
set the jumper on the good floppy the sames as the
bad one.
Also make sure you set the jumper on the MoBO to see
only one floppy else it won't boot.
Jumper 301 on the MoBo, it has 3 pins. Just set it to
pin 1 open and pins 2 & 3 jumpered. That will set the
MoBo to see just 1 drive. The jumper is next to the
floppy drive cable plug on the MoBo.
If you have a jumper or dip switch on the external
drive that will have to be set to df1. Not all external
drives that.