he Synology RX418 is a compact 4-bay 1U rackmount expansion unit designed for seamless storage growth with compatible RackStation servers like the RS822+, RS1221+, and RS818+. Supporting both 3.5" and 2.5" SATA drives, it connects via a dedicated eSATA port for plug-and-play capacity expansion. Its shallow 12-inch depth makes it an ideal choice for 2-post or wall-mount racks in space-constrained environments. Managed directly through DSM, the RX418 allows for online volume expansion or can serve as a dedicated local backup destination, providing a versatile and energy-efficient scaling solution for SMBs and branch offices.