The QNAP REXP-1200U-RP expansion enclosure is designed for expanding the storage space on the Turbo NAS & can support maximum 384TB 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 SE (Scalable 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-1200U-RP to a Turbo NAS* & power it on. The Turbo NAS will detect the hard drives in the REXP-1200U-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.