Problem mounting hdd?

[mdm mdmd]

Ok i have freebsd 5.0, and its on a hdd with 2.5 gigs and im trying to mount my slave drive that has and msdos filesystem with 30 gigs on it.  I use the command mount_msdosfs /dev/ad1s1 /slave, but it gives me an error saying something about next free block in fsinfo is too large.  I dont remember the exact message right now but if you need it i can get it.  I used to have RH linux on this and i could mount fine but i just switched to freebsd and im not familiar with it yet.  If anyone could help id very much appreciate it.
 
Thanks,
pyrodrummer


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