I tested each setup out using 2 RAID enclosures that I have to verify that the HR34 was in fact using the entire drive. One enclosure holds 2 drives. With that enclosure I tested 3TB RAID 1 (2x3TB drives), 6TB JBOD (2x3TB drives) and 4TB JBOD (2x2TB drives). The other enclosure I have holds 4 drives and supports RAID 5. With it I tested 12TB JBOD (4x3TB Drives) and I settled on using 9TB RAID 5 (4x3TB Drives).