Hi,
I have a Packard Bell USB Floppy Drive (bought from a charity shop for a quid" installed into a Poundland USB Hub on my Mac G4.
I've installed Fat95 (see Aminet) on my A4K and my Mac reads 1.4 M and 770 kb formatted disks from my A4K no probs.
Fat95 is better than CrossDos and also gives long file name support.
Kind Regards, Michael
aka rockape