| Model |
Synology DiskStation DS1821+ |
| Form Factor |
Desktop NAS (8-bay) |
| CPU |
AMD Ryzen V1500B Quad-Core 2.2 GHz |
| Memory (RAM) |
4 GB DDR4 ECC SODIMM (expandable up to 32 GB) |
| Drive Bays |
8 x 3.5″/2.5″ SATA HDD/SSD (expandable up to 18 with 2 expansion units) |
| Expansion Units |
Supports 2 x DX517 (for up to 18 drives total) |
| M.2 NVMe Slots |
2 x M.2 2280 NVMe SSD slots (for cache acceleration only) |
| Max Raw Capacity |
Up to 108 TB (with 18 x 6 TB drives, actual usable capacity varies) |
| RAID Support |
Synology Hybrid RAID (SHR), Basic, JBOD, RAID 0, 1, 5, 6, 10 |
| Network Ports |
4 x Gigabit Ethernet (Link Aggregation / Failover support) |
| PCIe Expansion Slot |
1 x PCIe Gen3 x8 (x4 link) – for 10GbE network card or M.2 SSD adapter |
| USB Ports |
4 x USB 3.2 Gen 1 |
| eSATA Ports |
2 x eSATA |
| Power Supply |
250W internal power supply |
| Cooling |
2 x 120mm fans (system-controlled or manual mode) |
| Operating System |
Synology DiskStation Manager (DSM) |
| Virtualization Support |
VMware vSphere, Microsoft Hyper-V, Citrix, OpenStack |
| File System |
EXT4 (internal); EXT4, EXT3, FAT, NTFS, HFS+, exFAT (external) |
| Dimensions |
166 x 343 x 243 mm |
| Weight |
5.1 kg (without drives) |
| Warranty |
3-Year Limited Warranty (extendable to 5 years in some regions) |
| Ideal For |
Small to medium businesses, content creators, virtualization, backup & storage |
