Nonsense. I use a Chinon FZ-357A HD 1.76MB floppy drive for years now in
both my A1200 & A600. They can read/write 1.76MB HD or 880K DD
disks without any modifications or problems!
I just recently bought a couple of FZ-357A, I use one of them in my A3000 and the other in an A500+. They both plugged in and worked straight off. No jumper settings or anything.