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Expansion unit that allows you to expand the storage space of Synology NAS servers by allowing you to create volumes on different drives with the following models:20:DS720+ Series19:DS1819+, DS1019+, DVA3219 Series18:DS1618+, DS918+, DS718+, NVR1218 Series17:DS1817+, DS1817, DS1517+, DS1517 Series16..