cannot modify files on DOS partition

From: TCMa (ma77777777772000_at_yahoo.ca)
Date: 06/18/04 

Date: 18 Jun 2004 14:15:41 -0700

I mount a DOS partition as rw.
Login as root still not able to modify files on it.
Why?

#mount
/dev/hdb2 on / type ext3 (rw)
none on /proc type proc (rw)
none on /dev/pts type devpts (rw,gid=5,mode=620)
usbdevfs on /proc/bus/usb type usbdevfs (rw)
/dev/hdb1 on /boot type ext3 (rw)
none on /dev/shm type tmpfs (rw)
/dev/hda8 on /mnt/dosg type msdos (rw)

# chmod a+w /mnt/dosg/xxxx
chmod: changing permissions of `/mnt/dosg/xxxx' (requested: 0777,
actual: 0755): Operation not permitted

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