Synology Expansion Unit DX517 5-Bay 3.5" Diskless Expansion NAS ( Compatible with Selected models)

Synology DX517 offers simple storage capacity expansion solution for your DiskStation through its intuitive plug-n-use design. DX517 allows you to instantly scale up to 5 additional hard drives, so that you can expand RAID volume online or deploy the drives as a dedicated local backup destination for yourDiskstation. Models compatible – DS1819+ DS1817+ DS1817 DS1815+ DS1618+ DS1517+ DS1517 DS1515+ DS1515 DS1019+ DS918+ DS916+ DS718+ D716+ DS716+II DS415+ DS218+ DS216+ DS216+II NVR1218 NVR216