The Synology RX1222sas is a high-capacity 12-bay 2U rackmount expansion enclosure designed for seamless storage scalability with Synology SA3400 and SA3600 NAS systems. Supporting both 3.5" and 2.5" SAS-3 and SATA III hard drives and SSDs, this hot-swappable expansion unit delivers plug-and-play storage expansion without service interruption. Add up to seven RX1222sas units per compatible NAS for a total of 96 drive bays (84 additional drives), enabling on-demand volume expansion through Synology Storage Manager without reformatting. Features dual redundant 500W power supplies and hot-swappable fans for maximum service uptime and reliability. Connectivity via one SAS input and one SAS output using included Mini-SAS HD cables ensures fast and stable data transfer. Compatible with Synology enterprise drives including HAT5300, HAS5300, and SAT5200 series, rigorously tested for optimal integration and performance. Built for enterprise data centers, production studios, and growing businesses requiring flexible, reliable storage expansion with minimal downtime. Includes easy-to-use DSM integration for intuitive online volume expansion and management. Backed by Synology's 5-year limited warranty with responsive technical support and hardware replacement services. Package includes two Mini-SAS HD cables, two AC power cords, and mounting hardware for both 3.5" and 2.5" drives.