The Synology DX525 is a 5-bay expansion module for the simple and seamless storage expansion of compatible Synology NAS models. It connects directly via eSATA and is automatically recognised by the system without the need to restart. No matter if you use it to expand existing volume or as a standalone backup target, the DX525 offers maximum flexibility for growing enterprise storage demands and ambitious home networks. Includes an eSATA cable, a power supply with a power cable and mounting materials to get you up and running in an instant. Highlights: - 5 additional drive bays for SATA HDDs/SSDs (3.5" or 2.5") - Hot-swap capability thanks to Plug and Play via eSATA - Automatic boot and shutdown together with the host NAS Compatible models: 25 series: DS925+ Please note: The DX525 is exclusively compatible with select NAS models.