The rapid USB 3.0 interface supports DUAL, JBOD, RAID 0 and RAID 1 modes. Dual: Each slot is recognized as an independent HDD. JBOD: Two HDD’s are combined and recognized as a single HDD drive. RAID 0: Data is striped into 2 HDDs for increased performance, but damage in 1 drive can cause total loss of data. RAID 1: By mirroring the same data in 2 HDDs, damage in 1 drive does not affect data in the other HDD. Supports ‘Port Multiplier’ function enabling two SATA HDDs to exchange data through a single USB connection and supports 2.5” and 3.5” SATA I/II HDDs up to 6TB(3TB for each slot). High quality, premium USB 3.0 cable and chipset have been utilized for a stable and error-free data transfer.