ahh looks like my retained info was correct, with regards to the USB External Floppy drive's, and yes 400k and 800k apple floppy drives were variable speed, 1.4m standard was fixed speed http://siber-sonic.com/mac/newmillfloppy.html'>http://siber-sonic.com/mac/newmillfloppy.html

in farther research the apple super drive will read/write 400k/800k/1.4m http://siber-sonic.com/mac/newmillfloppy.html

not too shabby,