it sholdn't be possible to overwrite it, as you should be running on devfs, which means that the file entires you have in /dev/ are not actually real files at all, and will be created each time you boot based on /etc/devfsd.conf or a similar configuration file.
if you are not running it then try "mknod /dev/fd0 b 2 0". a reboot should be the first route though
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