Synology DX1222 expansion units let you add capacity to your Synology DiskStation1 on the fly. Instantly leverage up to 12 additional 2.5 or 3.5 inch drives in the same deployment thanks to a small footprint, quick installation, and Synology DiskStation Manager’s (DSM) intuitive volume management options. The unit is backed by Synology’s 5-year limited warranty.