29RX1214RP Published October 8, 2014 at 266 × 266 in Synology Expansion Unit (RX1214RP) 12-Bay 3.5″ Synology Expansion Unit [RX1214RP] 12-Bay 3.5″ Diskless, NAS (2U Rack) (SMB/ENT), Redundant PSU, for scalable NAS models