You can probably reformat the /DataVolume partition to fat32, though it’ll mean embracing all the limitations of fat32. I don’t know how to make ext4 case-insensitive.This would be done by connecting over ssh, finding and editing the scripts used to mount partitions at boot, umount /DataVolume, and then reformat. I wouldn’t want a 3TB FAT32 partition, if that’s even possible.
I think I would create a file, format it as fat32, mount it somewhere, and share the contents. Something along the lines of
dd if=/dev/zero of=/DataVolume/FatVolume.img bs=4k count=8388608 #That’s 32gb if I got the multiplication right
mount -o loop /DataVolume/FatVolume /DataVolume/shares/FAT
Couple of potential problems with this. You need shell access, and to be more willing to look up the mkfs syntax than me. The share is easily added, just edit /etc/samba/overall_share. You also need to build / download the loopback module though. Directions for that are here http://mybookworld.wikidot.com/compiling-mybook-live-modules#toc11
If you trust me, a loop.ko I built a while ago can be downloaded here http://dl.dropbox.com/u/15522413/loop.ko until such point as I remember to delete it. So, it’s easily done, provided you have some basic knowledge of linux.