Synology DX Expansion Unit 5-Bay (DX517)
5 bays, 3.5"/2.5" SATA, Hot-swappable trays, eSATA port, 200W PSU, 60 TB max, 80mm x2 fans, RAID management via host NAS
Synology DX Series Expansion Unit 5-Bay Diskless Expansion (DX525)
5 bays, SATA HDD/SSD, 2.5"/3.5" drive support, hot-swap, desktop, 1x PSU, Kensington lock, 2 fans
Synology DiskStation DS925NEO+ 4-Bay 3.5" Diskless, AMD Quad Core CPU, 4GB Non-ECC RAM, 2x 2.5GbE, 2 x USB3.2, 1 x Expansion port, 3 Yr Wty DSM7.3
Synology DiskStation NAS 2-Bay (DS725+)
2-bay, AMD Ryzen R1600 2.6GHz, 4GB DDR4 ECC (up to 32GB), 1 x 2.5GbE + 1 x 1GbE, 2 x M.2 (SSD cache), USB 3.2, Expansion USB-C, Tower
Synology RX Expansion Unit 4-Bay 1U Rackmount (RX418)
4 bays, 1U rackmount, 3.5"/2.5" SATA HDD/SSD, 48 TB max, eSATA x1, 100W PSU, RAID management
Synology DiskStation 4-Bay NAS (DS925+)
4 bays, AMD Ryzen V1500B quad-core 2.2GHz, 4GB DDR4 ECC SODIMM (expandable to 32GB), 2 x 2.5GbE, 2 x M.2 NVMe slots, 2 x USB 3.2, 1 x expansion port, Tower
Synology DX1215II Expansion Unit 12-Bay (DX1215II)
12 bays, 3.5"/2.5" SATA HDD/SSD, hot-swappable, expansion port x1, 550W PSU, desktop form factor, RAID management, 192TB raw max
Synology DiskStation NAS 5-Bay (DS1525+)
5 bays, AMD Ryzen V1500B 2.2GHz, 8GB DDR4 (up to 32GB), 2 x 2.5GbE, 2 x M.2 NVMe, USB 3.2 (2), eSATA, Tower
Synology RackStation Expansion Unit 12-Bay 2U Rackmount (RX1217)
12 x 3.5/2.5" SATA bays, Diskless, 2U rackmount, Infiniband expansion port, 500W PSU, Hot-swappable drives, Max 144 TB
Synology DiskStation 12-Bay Tower NAS (DS2422+)
12 bays, AMD Ryzen V1500B 2.2GHz quad-core, 4 GB DDR4 (max 32 GB), 4x Gigabit RJ-45, 2x USB 3.2 Gen1, PCIe x8 (Gen3) slot, Tower, RAID 0/5/6/10/JBOD
Synology RX Series Expansion Unit 12-Bay (RX1217RP)
12 bays, 2U rackmount, hot-swappable, redundant power supply, 500W PSU, 1 expansion port, 3.5"/2.5" SATA support, RAID via DSM
Synology RX Series Expansion Unit 12-Bay Rackmount (RX1217sas)
12 bays, 3.5"/2.5" SAS/SATA, SAS IN/OUT x1, Dual 500W PSU, Hot-swappable bays, Rackmount, RAID management
Synology RackStation Rackmount NAS 12-bay (RS3621RPXS)
12 bays, Intel Xeon D-1531 6-core 2.2/2.7GHz, 8GB DDR4 ECC (up to 64GB), 4 x 1GbE, 2 x PCIe Gen3 x8, 2 x USB 3.2 Gen1, Redundant PSU
Synology RackStation Rackmount NAS 12-bay (RS3621xs+)
12 bays, Intel Xeon D-1541 8-core 2.1/2.7GHz, 8GB DDR4 ECC, 4 x 1GbE + 2 x 10GbE, 2 x PCIe Gen3 x8, 2 x USB 3.2, 2U rackmount
Synology Expansion Unit RX426 4-Bay 3.5" Diskless NAS (1U Rack) for Scalable Models (SMB)
Synology NAS Expansion Enclosure 12-Bay Diskless (DX1222)
SATA III, 12 bays, Supports 3.5"/2.5" drives, Hot-swappable bays, 2x 120mm fans, 192 TB max, AC powered, Black