Even if you had a floppy drive that would spin at half the speed, you also need to find someway of getting the motherboard to generate the correct id for a high density drive. I'm not even sure an a500/a600/a1200 can do that, on the a3000/a4000 there are jumper settings on the motherboard to do it.
Of course they can - but there are "stupid" drives that need software and then smart ones like in my A500's DF0: that just work.
