The QNAP REXP-1600U-RP expansion enclosure is designed for expanding the storage space on the Turbo NAS & can support maximum 512 TB 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. Contains the WD Enterprise RE (RAID Edition) Hard Disk Drives Highlights: Plug & use, seamless capacity expansion Missing mode protection High density, high efficiency & high scalability Flexibly manage storage with the QTS Storage Manger Supports SAS/SATA 6 Gbps hard drives & SSD Backup storage for the Turbo NAS Plug & use, seamless capacity expansion Simply connect a REXP-1600U-RP to a Turbo NAS* & power it on. The Turbo NAS will detect the hard drives in the REXP-1600U-RP as newly installed local drives. The Turbo NAS capacity can be expanded seamlessly by using the powerful QTS Storage Manager. *QTS 4.0.4 or newer is required for the Turbo NAS. Missing mode protection When the disconnection of a RAID expansion enclosure is detected, the Turbo NAS blocks IO access to protect data. The system can recover from the missing mode to the normal state with data staying intact. High density, high efficiency & highly scalable The REXP-1600U-RP supports 16 hard drives & 64TB raw capacity in 3U rack space. The REXP-1600U-RP 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. Powerful QTS Storage Manager The QTS Storage Manager neatly presents tools & options for managing system storage with an intuitive graphical user interface, which simplifies the process of NAS capacity expansion & REXP-1600U-RP management. IT administrators can easily monitor the health status of REXP-1600U-RP & the disks within it. When cascading multiple expansion enclosures in a rack, the Locate Disk & Locate Enclosure functions assist IT administrators for quick maintenance. An excellent backup solution for the Turbo NAS In addition to expanding an existing volume, IT administrators can use the REXP-1600U-RP as a budget-friendly external storage to perform speedy & secure backup tasks for the Turbo NAS. The QNAP RTRR (Real-Time Remote Replication) or rsync service lets IT administrators back up the Turbo NAS data to the REXP-1600U-RP on a real time or scheduled basis.