problems mounting dos floppy

I cant mount my floppy disk.

i use:
mount -t dos /dev/fd0 /dos_floppy

but I cant copy my floppy archives:

cp /dos_floppy/one /execicies/one

no such a device or adress

why?

S.O. QNX 6.2, AMD 200MMX

Does “ls -l /dev/fd0” show the device exist?
Is the disk in DOS format?