He rexp 1620u rp expansion enclosure is designed for expanding the storage space on a qnap nas by connecting multiple expansion enclosures via high speed mini sas cables featuring a 12 gbps sas interface on the chassis the rexp 1620u rp ensures fast data passthrough from 12 gbps sas enabled qnap nas even when using 6gbps hard drives this is especially useful for large data applications that require high performance interconnection such as video surveillance archiving large data and tv bro