Key Features Plug-n-use design for seamless storage space upgrade Online volume expansion on the fly Redundant power supplies ensure service uptime (RX1217RP only) Managed from Synology Disk Station Manager (DSM) Synology Expansion Unit RX1217/RX1217RP delivers an effortless solution for data volume expansion and data backup for Synology 2U Rack Station NAS. With additional 12 drive bays, RX1217/RX1217RP seamlessly expands the storage capacity of the connected Synology NAS on-the-fly. Synology RX1217/RX1217RP is backed with Synology\'s 5-year limited warranty. Volume Expansion & Backup When running out of storage capacity on the Synology 2U Rack Station1, Synology RX1217/RX1217RP provides an easy way to immediately scale capacity by additional 12 drives. The RAID volume on the Synology Rack Station can be expanded directly without having to reformat the existing drives, ensuring the Synology Rack Station continues its service during the capacity expansion. Synology RX1217/RX1217RP can be used as a dedicated local backup solution for the Synology Rack Station. When created as a separate volume, RX1217/RX1217RP provides a great backup solution to its local drives in case of system failure. Reliable Plug-n-use Design Synology 2U Rack Station securely connects to RX1217/RX1217RP with an high-bandwidth expansion cable that ensures maximum throughput. It allows the drives in the connected RX1217/RX1217RP to operate as they are the internal ones of the Synology Rack Station, with no lag in data retrieval. With SATA 6Gb/s interface support, Synology RX1217/RX1217RP unleashes the full performance of the installed drives and provides outstanding data transfer rate. To ensures 24/7 service uptime, Synology RX1217RP is equipped with redundant power supply units, allowing automatic fail-over support if one of the PSUs is failed. Green & Easy to Manage Deep Sleep can be manually configured to take effect automatically when the system has been inactive for a period of time. This not only s