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| Brand | Synology |
| Model | Synology DiskStation DS1821+ |
| CPU Model | AMD Ryzen V1500B |
| CPU Frequency | Quad Core, 2.2 GHz |
| Hardware Encryption Engine | Yes (AES-NI) |
| System Memory | 4GB DDR4 ECC SODIMM |
| Memory Slots | 2 |
| Memory Expandable | Up to 32 GB (16 GB x 2) |
| Internal Storage | 8TB / 4x 2TB SATA HDD |
| Hard Drive Warranty | One Year |
| Storage Drive Bay(s) | 8 |
| Maximum Drive Bays with Expansion Unit | 18 |
| M.2 Drive Slots | 2 (NVMe) |
| Compatible Drive Type | 3.5”, 2.5” SATA, M.2 2280 NVMe SSD |
| Hot Swappable Drive | Yes |
| External Ports | USB 3.2 Gen 1 Port x4, eSATA Port x2, PCIe Expansion 1x Gen3 x8 slot (x4 link) |
| File System | Internal: Btrfs, EXT4, External: Btrfs, EXT4, EXT3, FAT, NTFS, HFS+, exFAT* |
| LAN | Gigabit (RJ-45) x 4 |
| System Fan | 120 mm x 120 mm x 2 pcs |
| Fan Speed Mode | Cool Mode, Quiet Mode, Full-Speed Mode |
| Noise Level | 22.2 dB(A) |
| Power Recovery | Yes |
| Power Supply Unit / Adapter | 250W |
| AC Input Power Voltage | 100V to 240V AC |
| Power Frequency | 50/60 Hz, Single Phase |
| Power Consumption | 59.8 W (Access), 26.18 W (HDD Hibernation) |
| Operating Temperature | 0°C to 40°C (32°F to 104°F) |
| Storage Temperature | -20°C to 60°C (-5°F to 140°F) |
| Relative Humidity | 5% to 95% RH |
| Certification | FCC, CE, EAC, BSMI, VCCI, CCC, RCM, KC |
| Dimensions (W x D x H) | 343 x 243 x 166 mm |
| Weight | 6.0 kg |
| Warranty | Three Years |
