if you post your /etc/fstab it will help wit the mount part.
you could probably mount the hdd manually.
what you do is type (as root) mount -t vfat /dev/hdXY /mnt/c
for this to work you need to have the directory /mnt/c first (mkdir /mnt/c).
the XY are driveletter and partition number.
to see your /etc/fstab might help. and together with that the output from fdisk -l.