
took me a while after finding various methods on various forums (none of which worked specifically but various elements pieced together did).
First I set my IP address for the DNS320 to static (using the LAN settings in the Web Interface)
Then in the debian terminal I created a directory under media called dlink (call it whatever you like though)
mkdir /media/dlink/
I then edited the fstab settings with
nano /etc/fstab/
after the last line i added (using my now fixed IP for the 320)
//192.168.1.68/Volume_1/ /media/dlink
(Doing this means you keep the mount when you reboot the debian machine) ctrl X to exit and y to save, then hit enter to return to terminal, then
mount /media/dlink/
it was immediately clear that something had worked as I heard the 320 disks spin-up.
Hope this is usefull for anyone attempting to do the same thing