in linux you have to mount the floppy, then transfer the files and unmount floppy. little hard remembering to begin with but works well.
why? this is because you have no acess to the /mnt/fd0 (floppy) without this mounting, to remove floppy you must unmount it, and perhaps sync it(open console and type sync), otherwise it might not have been vritten to fully (should be done at unmont but...),