I got it to work this weekend:
1. Place the new harddrive (Samsung HD154UI SpinPoint 1.5TB) in my LinkStation HS DH320GL
2. Connect the station to my computer, where the computer LAN is configured with IP 192.168.11.1
3. Run the tftp service
4. Start the linstation. It will now boot using the tftp service
5. Run the Firmware updater, version 2.11
6. Be patient.... and all done.