Expansion Unit RX418

4-bay SATA expansion unit for
- 22 series : RS822RP+, RS822+
- 21 series : RS1221RP+, RS1221+
- 20 series : RS820RP+, RS820+
 - 19 series : RS1219+, RS819
 - 18 series : RS818RP+, RS818+
 - 16 series : RS816
 - 15 series : RS815RP+, RS815+, RS815

 : 3.5" SATA HDD
 : 2.5" SATA HDD
 : 2.5" SATA SSD