The Synology DX1222 is a 12-bay expansion unit designed for seamless storage scalability with Synology DS3622xs+ and DS2422+ NAS systems. Supporting both 3.5" and 2.5" SATA hard drives and SSDs with hot-swappable drive bays, this expansion unit enables online storage expansion without interrupting services or reformatting drives. Plug-and-play design connects via Mini-SAS HD port with included expansion cable for fast setup and immediate recognition through DiskStation Manager (DSM). Add up to two DX1222 units per compatible NAS for flexible capacity expansion while maintaining unified drive management, monitoring, and administration from a centralized DSM interface. Optimized for use with Synology HAT5300 3.5" HDDs and SAT5200 2.5" SSDs for maximum reliability and performance. Powered by a 550W power supply operating at 100-240 VAC 50/60 Hz. Includes AC power cord, Mini-SAS HD expansion cable, two hard drive tray keys, and mounting screws for 2.5" drives. Ideal for businesses requiring flexible storage expansion for file servers, backup repositories, and growing data deployments. Backed by Synology's 5-year limited warranty with responsive technical support and hardware replacement services.