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Knowledge Center

Which Synology NAS model can I use with Synology Expansion Units?

Last updated:May 21, 2025

Which Synology NAS model can I use with Synology Expansion Units?

Details

Synology expansion units are designed for pairing with specific expansion-ready NAS products (including DiskStation, RackStation, and FlashStation) to increase internal volume, or form independent volumes for backup or additional storage.

Resolution

Refer to the table below for matched Synology NAS models and expansion units:

Expansion Units
Synology NAS Models
FX2421
FS64001, FS36001, FS34001
RX6025sas
HD6500
RX6022sas
HD6500
RX2417sas
FS6400, FS3400, FS30172, FS2017, SA3600, SA3400, RS18017xs+
RX1225RP
RS2825RP+
RX1223RP
SA6400, RS2423RP+, RS2423+
RX1222sas
SA3610, SA36003, SA3410, SA34003
RXD1219sas
SA3400D, SA3200D
RX1217sas
FS6400, FS3600, FS3400, FS30172, FS2017, SA3600, SA3400, RS18017xs+
RX1217(RP)
RS4021xs+, RS4017xs+, RS3621xs+, RS3621RPxs, RS3618xs, RS3617xs+, RS3617(RP)xs, RS3614xs+, RS3614(RP)xs, RS3413xs+, RS3412(RP)xs, RS3411(RP)xs, RS2821RP+, RS2818RP+, RS2421(RP)+, RS2418(RP)+, RS2416(RP)+, RS2414(RP)+, RS2212(RP)+, RS2211(RP)+, RS1619xs+
RX1216sas
RS18016xs+
RXD1215sas
RC18015xs+
RX1214(RP)
RS3618xs, RS3617xs+, RS3617(RP)xs, RS3614xs+, RS3614(RP)xs, RS3413xs+, RS3412(RP)xs, RS3411(RP)xs, RS2416(RP)+, RS2414(RP)+, RS2212(RP)+, RS2211(RP)+
RX1213sas
RS10613xs+
RX1211(RP)
RS3413xs+, RS3412(RP)xs, RS3411(RP)xs, RS2212(RP)+, RS2211(RP)+
RX418
RS1221(RP)+, RS1219+, RS822(RP)+, RS820(RP)+, RS819, RS818(RP)+, RS816, RS815(RP)+, RS815
Independent volumes only: RS217
RX415
RS818(RP)+, RS816, RS815(RP)+, RS815, RS814(RP)+, RS814, RS812(RP)+, RS812
Independent volumes only: RS217, RS214
RX410
RS814(RP)+, RS814, RS812(RP)+, RS812, RS810(RP)+
DX1222
DS3622xs+, DS2422+
DX1215II
FS10184, DS3617xsII, DS3617xs4, DS3615xs4, DS3612xs4, DS3611xs4, DS3018xs4, DS2419+II, DS2419+4, DS2415+4, DS2413+4, DS2411+4, DS2015xs4
DX1215
FS1018, DS3617xsII, DS3617xs, DS3615xs, DS3612xs, DS3611xs, DS3018xs, DS2419+II, DS2419+, DS2415+, DS2413+, DS2411+, DS2015xs
DX1211
DS3612xs, DS3611xs, DS2413+, DS2411+
DX525
DS1825+, DS1525+, DS925+, DS725+
DX517
DS1823xs+, DS1821+, DS1819+, DS1817+, DS1817, DS1815+5, DS1621xs+, DS1621+, DS1618+, DS1522+, DS1520+, DS1517+, DS1517, DS1515+5, DS1515, DS1019+, DS923+, DS920+, DS918+, DS916+5, DS723+, DS720+, DS718+, DS716+, DS716+II, DVA3221, DVA3219, NVR1218, NVR2165
Independent volumes only: DS415+5, DS218+, DS216+5, DS216+II5
DX513/DX213
DS1817+, DS1815+, DS1813+, DS1812+, DS1517+, DS1515+, DS1515, DS1513+, DS1512+, DS1511+, DS1010+, DS916+, DS716+, DS716+II, DS715, DS713+, DS712+, DS710+, NVR216
Independent volumes only: DS415+, DS413, DS412+, DS216+, DS216+II, DS215+, DS214+, DS214play, DS213+, DS212+, DS115, DS114, DS112+, DS112
DX510
DS1813+, DS1812+, DS1513+, DS1512+, DS1511+, DS1010+, DS713+, DS712+, DS710+

Expansion units may be able to automatically power-on/off. However, expansion units and paired Synology NAS must be connected using the original cable provided by Synology Inc.; otherwise automatic power-on/off may not function normally.

Notes:

  1. Please update your DSM to at least version 6.2.3-25426-2 before scaling up with FX2421.
  2. Connecting to a Synology FlashStation FS3017 requires the FS3017 Expansion Card to be installed on the host device. FS3017 Expansion Card is sold separately.
  3. Please update your DSM to 6.2.4-25556 Update 3 (for DSM 6.2 versions) or 7.0.1-42218 Update 2 (for DSM 7.0 versions) or above before scaling up with RX1222sas.
  4. Please update your DSM to 6.2.4-25556 or above before scaling up with DX1215II.
  5. Please update your DSM to at least version 6.2.1-23824-5 before scaling up with DX517 (update to at least version 6.2.2 with NVR216).
  6. Certain models may not be available in your location. Please contact your local distributors for more information.