On-the-Fly Storage Expansion for Synology Disk Station Synology DX1215II expansion units are designed to provide effortless storage expandability for Synology Disk Stations. The modest 12-bay desktop form factor allows for maximum storage scalability while taking up minimal space. Plug it in & start leveraging your new storage space thanks to easy installation. Expand Disk Station With Synology Drives Synology HAT5300 SATA HDDs, developed in tandem with Synology storage systems, provide proven interoperability & high reliability through rigorous validation. Combine HAT5300 drives with Synology Disk Station & DX1215II for a highly reliable & integrated storage setup, & receive long-term Synology updates & support. Compact Storage for Easy Expansion It is easy to expand your Synology Disk Station 1 with 12 additional 3.5 inch drive bays with the DX1215II expansion unit. The plug-&-play design adds drives to the host Disk Station without additional setup or downtime. Features Seamless Storage Expansion: Add 12 additional drive bays to your Synology Disk Station. Best Fit With Synology Enterprise HDD: Use with Synology HAT5300 SATA HDDs for high performance & verified compatibility. Easy Hardware Setup: Plug-&-play design makes upgrading storage easy.