eSATA II – 3Gbps 4Ports with Raid5, Raid10, Raid0, Raid1, Port Multiplier and NCQ! RAID 5 (Distributed Parity RAID), JBOD (Just Bunch of Disks), RAID 0 (Striping), RAID 1 (Mirroring) and RAID 0+1 (mirrored-stripping) improve the data performance and provide the data redundancy and rebuilding. For more details on product, Please refer to http://www.papyrus.co.il/raid5_sata_ii_3gbps_4ports_low_profile_pci.htm