Hi I also have a DSN 320 and I have been trying to install 2 new 3tb hard drives but when it formats them as raid 1 it turns into a 786gb raid 1 drive. I have tried several times after removing the 4 or 5 partitions it creates. Most of which are designated unassigned. I've also installed a firmware update to 2.05 to no avail, and now after a factory reset it has become unresponsive. I don’t know what to try next can anyone help please.