Synology DX1222 12-Bay Disk Expansion Unit (Diskless)

The Synology DX1222 is a 12-bay disk expansion unit designed to extend the raw storage capacity of compatible Synology DiskStation NAS devices. When your primary NAS runs out of drive bays, the DX1222 connects via an expansion cable and appears within Synology's DiskStation Manager (DSM) operating system, allowing you to incorporate the additional drives into new or existing storage pools, volumes, and RAID configurations. Each of the 12 bays accepts either a 3.5-inch hard drive or a 2.5-inch drive, giving you the flexibility to mix high-capacity HDDs for bulk storage with SSDs for performance-sensitive workloads.

At 18.5 x 17.5 x 17 inches, the DX1222 is built for environments where rack or shelf space is available — home offices, small businesses, creative studios, or server rooms that need to scale without replacing their core NAS hardware. The unit ships diskless, so you choose drives that match your capacity, performance, and budget requirements. Backed by Synology's 5-year limited warranty, it is positioned as a long-term infrastructure component rather than a stopgap measure, making it a practical choice for users who anticipate continued data growth and want to expand without migrating to an entirely new system.