Easily add 5 additional drive bays to your Synology DiskStation. Supporting both 2.5" and 3.5" SATA drives, the DX517 is a versatile solution that supports capacity expansion without downtime or serves as a local backup destination. Managed by DiskStation Manager on the main NAS, the additional bays in the DX517 are ready for use as soon as they are connected. The on-the-fly capacity expansion ensures that storage and services on the host are not interrupted during the expansion.