SYNOLOGY Storage Expansion Module 12BAY NO HDD RX1223RP With the Synology RX1223RP expansion module, you can add up to 96 storage compartments to compatible devices. Increase or create new volumes without system downtime or maintenance due to the rapid expansion of storage. The RX1223RP makes it easy to expand the storage system with 12 compartments for 2.5-inch and 3.5-inch SATA HDD/SDD drives.