The Synology DX1215 is a dedicated expansion unit designed to increase the storage capacity of your existing NAS system. It provides 12 drive bays utilizing the SATA III 6Gb/s interface, allowing you to add a significant amount of additional disk space through a single eSATA port connection. Housed in a black Disk Station chassis measuring 300 x 270 x 340 mm and weighing 9 kg, the unit supports hot-swappable drives so you can replace or add disks without powering down your system. This makes it a practical choice for growing businesses or power users who need to scale their data archives while maintaining continuous uptime in environments kept between 5°C and 35°C.