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General| Model | DS1821+ |
|---|---|
| Category | NAS |
| CPU | AMD Ryzen V1500B |
| CPU Architecture | 64-bit |
| CPU Frequency | 2.2 GHz |
| CPU Cores | 4 |
| Hardware Encryption Engine | Yes |
| Memory | 4 GB DDR4 ECC SODIMM |
| Drive Bays | 8 |
| Maximum Drive Bays with Expansion Unit | 18 |
| Compatible Drive Type | 3.5" SATA HDD, 2.5" SATA HDD, 2.5" SATA SSD |
| Hot Swappable Drive | Yes |
| RJ-45 1GbE LAN Port | 4 |
| LAN Ports | 4 |
| PCIe Expansion | 1 x Gen3 x8 slot (x4 link) |
| File System | Btrfs, EXT4 |
| Wake on LAN | Yes |
| Scheduled Power On/Off | Yes |
| Power Supply Unit | 250W |
| AC Input Power Voltage | 100V to 240V AC |
| Operating Temperature | 0°C to 40°C (32°F to 104°F) |
| Operating System | DiskStation Manager (DSM) |
| Warranty | 3 years |
| Maximum Memory Capacity | 32 GB |
| Maximum Internal Raw Capacity | 128 TB |
| Maximum Raw Capacity with Expansion Units | 288 TB |
| M.2 SSD Slots | 2 (NVMe) |
| External Ports | 4 x USB 3.2 Gen 1, 2 x eSATA |
| Dimensions | 166 mm x 343 mm x 243 mm |
| System Fan | 120 mm x 120 mm x 2 pcs |
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