Synology Expansion Unit RX1217sas 12-Bay 3.5" Diskless NAS (2U Rack) (SMB/ENT) for Scalable NAS Models ( see compatability)

Synology RX1217sas delivers an effortless solution for volume expansion and data backup for Synology FlashStation/RackStation by adding 12 SAS/SATA drive bays on-the-fly. Synology RX1217sas is backed with Synology’s 5-year limited warranty. Connecting to a Synology FlashStation FS3017 requires the optional FS3017 Expansion Card FXC2017 to be installed on the host device.