cant write in msdos /win98 partition

[Marlon Corleone]

fstab file:

/dev/ad0s1              /win98          msdos   rw    
         0       0


i tried remounting: mount -o rw -t msdos /dev/ad0s1
/win98

but when i try to write to /win98 partition, says: the
file could not be saved. Please check if you have
write permission.

though i set rw in my fstab options, still wont work.
any ideas? thanks

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