mount_msdosfs problem

[giamma]

Hi! I have a problem whith mount_msdosfs. When I try to mount a floppy doing 
#mount_msdosfs /dev/fd0 /floppy
I get the error: Operation not permitted on this device. What's happening?
I'm root, sometimes toor, how can I don't have the rigth permissions?
I'm the sysadmin!!
I also tried #kldstat and I'm sure that the module msdosfs.ko is loaded
into the kernel. Where's the mistake? Thank you in advance.
Greetings, Gianmario.