The QNAP REXP-1000 Pro expansion enclosure is designed for expanding the storage space on the Turbo NAS & can support maximum 250TB raw capacity* by connecting multiple expansion enclosures via high-speed mini SAS cables. This is especially useful for large data applications, such as video surveillance, data archiving, & TV broadcast storage. High density, high efficiency & highly scalable The REXP-1000 Pro supports 10 hard drives & 50TB raw capacity, & has two SAS wide ports (IN port & OUT port) for host connectivity & daisy-chain respectively. Each SAS wide port combines four SAS channels (maximum 8 SAS channels supported per expansion enclosure). The solution delivers unprecedented performance of up to 24 Gbps per host connection.