Expansion Unit RXD1219sas Reliable and highly scalable SAS storage expansion unit for your Synology servers On-the-fly SAS expansion up to 12 additional bays RXD1219sas is a 2U expansion unit designed to work automatically when connected, providing an effortless storage space upgrade solution for your Synology servers1. You can add up to 12 additional 2.5" / 3.5" SAS drive bays on the fly when connected directly with a mini-SAS HD cable. Designed for maximum reliability The redundant power supplies ensure maximum service uptime. On the rare occasion when a failure occurs, you can instantly replace the hot-swappable drive trays, and with the key system components modularized, SAS modules and system fans can also be replaced with ease. High-performance data transmission The mini-SAS HD provides high bandwidth connectivity to achieve maximum throughput during data transfer between your Synology server and RXD1219sas. It allows the drives in the connected RXD1219sas to operate as if they are the internal drives of the Synology server with no data latency. 5-year warranty As we're committed to improving product innovation and quality, Synology guarantees a robust and reliable data management experience with a 5-year limited warranty, providing responsive technical support and hardware replacement services to maximize your return on investment.