Synology DX517 5-Bay Expansion Unit - eSATA Expansion for DiskStation NAS

‌Expand your Synology DiskStation storage instantly with the DX517 5-bay expansion unit. Add up to five additional SATA drives using a single eSATA connection, managed seamlessly through Synology DSM. Supports hot-swap drives, RAID management, and synchronized power control with the host NAS. Ideal for growing storage needs without replacing your existing system.

Compatible with popular Plus and xs+ series, including:

• 23 Series: DS1823xs+, DS923+, DS723+

• 22 Series: DS1522+

• 21 Series: DS1821+, DS1621xs+, DS1621+, DVA3221

• 20–17 Series: DS1520+, DS920+, DS720+, DS1817+, DS1517+

• Older models supported with DSM requirements