Error while mounting Fat32-Partition

[Stefan Malte Schumacher]

Hi

Before adding my Fat32-Partitions to /etc/fstab I have tried to mount them
manually. All Partitions work except one whis is a primary fat16 partition
on my first drive. 

This is the error message :

root at avalon /mnt mount -t msdos /dev/ad0s1 C
Next free cluster in FSInfo (4294967295) exceeds maxcluster (1034161)
msdosfs: /dev/ad0s1: Invalid argument

Another question : Is the following entry in fstab correct ? I don't want to
kill my filesystems or something :

/dev/ad4s1              /mnt/I          msdos   rw              0       0

Bye
Stefan