Floppy disks? What are those? :-D
The exception to this rule are the famous Amiga "Half-speed HD" mechanisms, that halve the SPINDLE speed when you insert a HD disk.
I think that the Amiga could only read data at 22Kps off the floppy port. HD drives spin at the same speed as the old DD drives but since the data is stored at twice the density, data was sent at 44Kps. So Commodore had a 'hack' to half the motor speed when an HD floppy was in the drive in order to get the data rate back down to 22Kps.
Jope might be right. He may be able to just plug it in and be able to use DD disks, however I don' t think HD disks would work because of the speed issue. You'd need some sort of hack to half the drive speed when an HD disk was inserted.