Product Specification of DiskStation DS1821+ Storage
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ProcessorAMD Ryzen™ V1500B quad-core 2.2 GHz
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Memory4GB DDR4 ECC SODIMM (expandable up to 32GB)
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Drive Bays8 bays (expandable up to 18 with DX517 x2)
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Drive Support3.5" / 2.5" SATA HDD/SSD, 2 x M.2 NVMe 2280 SSD (cache only)
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Max Internal Raw CapacityUp to 240TB (with expansions)
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RAID SupportBasic, JBOD, RAID 0, 1, 5, 6, 10, Synology Hybrid RAID (SHR)
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Network Ports4 x 1GbE RJ-45 (Link Aggregation/Failover supported)
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PCIe Expansion1 x PCIe Gen3 x8 slot (for 10GbE NICs or M.2 SSD adapters)
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USB Ports2 x USB 3.2 Gen 1
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eSATA Portss2 x for DX517 expansion
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Cooling2 x 120mm fans (adjustable speed)
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Power Supply250W AC power adapter
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Dimensions166 x 343 x 243 mm
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Operating Temperature5°C to 35°C
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SoftwareSynology DiskStation Manager (DSM 7.0+)




