Expansion Unit for Synology DX517 NAS Servers

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+ Series
19:DS1819+, DS1019+, DVA3219 Series
18:DS1618+, DS918+, DS718+, NVR1218 Series
17:DS1817+, DS1817, DS1517+, DS1517 Series
16:DS916+, DS716+, DS716+II series
15:DS1815+, DS1515+, DS1515 Series

allows you to create vlumes but only on individual drives with NAS models:
18:DS218+ Series
16:DS216+, DS216+II, NVR216 Series
15:DS415+ Series

Maximum supported raw capacity of 80TeraBytes with 5 disks of 16 TeraBytes each, the capacity varies depending on the type of RAID implemented