8-bay scalable desktop NAS
Synology DS1821+ 8-bay Scalable Desktop NAS
An eight-bay NAS with AMD Ryzen processing, ECC memory, dual M.2 NVMe slots and expansion to 18 drives.
- Processor
- AMD Ryzen V1500B
- Memory
- 4 GB DDR4 ECC SODIMM
- Drive bays
- 8; up to 18 (DX517 × 2)
- Networking
- 4 × 1GbE
Build a scalable storage foundation for growing teams
The Synology DS1821+ combines eight hot-swappable bays with ECC memory, four 1GbE ports, two M.2 NVMe slots and PCIe expansion. It suits businesses and advanced users planning centralised file services, backup and storage growth in a desktop form factor.
Eight internal bays
Create a large shared-storage pool with supported 3.5-inch or 2.5-inch SATA drives.
Expansion to 18 drives
Connect two DX517 units when the deployment grows beyond the internal bays.
ECC memory protection
Start with 4 GB DDR4 ECC memory and expand to the supplied 32 GB maximum.
Four 1GbE ports
Multiple built-in network interfaces provide flexible connectivity options.
Dual M.2 NVMe slots
Use compatible M.2 2280 NVMe SSDs for the supported roles specified by Synology.
PCIe upgrade path
The Gen3 x8 slot supports compatible network or adapter expansion.
Who is the Synology DS1821+ best for?
A strong choice for
- Growing small-business storage
- Centralised backup repositories
- Teams needing eight internal bays
- Deployments planning later expansion
- Advanced home or studio storage
Consider another model if you need
- You need built-in 10GbE
- You require more than 18 drives
- You need redundant power
- You prefer a current-generation model for a new long-term deployment
Key specifications
- Model
- DS1821+
- Product type
- 8-bay scalable desktop NAS
- Processor
- AMD Ryzen V1500B
- CPU cores
- 4
- CPU frequency
- 2.2 GHz
- System memory
- 4 GB DDR4 ECC SODIMM
- Maximum memory
- 32 GB (16 GB × 2)
- Drive bays
- 8; up to 18 (DX517 × 2)
- Drive categories
- | 3.5" SATA HDD; 2.5" SATA HDD; 2.5" SATA SSD; M.2 2280 NVMe SSD
- Built-in network
- 4 × 1GbE
- USB ports
- 4 × USB 3.2 Gen 1
- M.2 slots
- 2 (NVMe)
- PCIe expansion
- 1 × Gen3 ×8 slot (x4 link)
- Dimensions
- Not specified
- Weight
- 6 kg
- Warranty
- 3-year hardware warranty, extendable to 5 years with extended warranty plus
Full technical specifications
Processor, memory and storage
| CPU Model | AMD Ryzen V1500B |
|---|---|
| CPU Quantity | 1 |
| CPU Core | 4 |
| CPU Architecture | 64-bit |
| CPU Frequency | 2.2 GHz |
| Hardware Encryption Engine | Supported |
| System Memory | 4 GB DDR4 ECC SODIMM |
| Memory Module Pre-installed | 4 GB (4 GB × 1) |
| Total Memory Slots | 2 |
| Maximum Memory Capacity | 32 GB (16 GB × 2) |
| Memory notes | | Synology reserves the right to replace memory modules with the same or higher frequency based on supplier's product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance.; Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion. | |
| Drive Bays | 8 |
| Maximum Drive Bays with Expansion Unit | 18 (DX517 × 2) |
| M.2 Drive Slots | 2 (NVMe) |
| Drive Type | | 3.5" SATA HDD; 2.5" SATA HDD; 2.5" SATA SSD; M.2 2280 NVMe SSD |
| Hot Swappable Drive* | Supported |
| Storage notes | The hot swappable drive feature is not supported by M.2 SSD slots. |
Network, ports and expansion
| RJ-45 1GbE LAN Port | 4 |
|---|---|
| USB 3.2 Gen 1 Port* | 4 |
| Expansion Port | 2 |
| Expansion Port Type | eSATA |
| External Ports notes | The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019. |
| PCIe Expansion | 1 × Gen3 ×8 slot (x4 link) |
Physical design and power
| Size (Height × Width × Depth) | 166 mm × 343 mm × 243 mm |
|---|---|
| Weight | 6 kg |
| System Fan | 120 mm × 120 mm × 2 pcs |
| Fan Speed Mode | | Full-Speed Mode; Cool Mode; Quiet Mode |
| Easy Replacement System Fan | Supported |
| Brightness Adjustable Front LED Indicators | Supported |
| Power Recovery | Supported |
| Noise Level* | 22.2 dB(A) |
| Scheduled Power On / Off | Supported |
| Wake on LAN / WAN | Supported |
| Power Supply Unit / Adapter | 250 watts |
| AC Input Power Voltage | 100V to 240V AC |
| Power Frequency | 50/60 Hz, Single Phase |
| Power Consumption | 59.8 watts (Access); 26.18 watts (HDD Hibernation) |
| British Thermal Unit | 204.05 BTU/hr (Access); 89.33 BTU/hr (HDD Hibernation) |
| Others notes | | Power consumption is measured when it is fully loaded with Western Digital 1TB WD10EFRX hard drive(s).; Noise Level Testing Environment: Fully loaded with Seagate 2TB ST2000VN000 hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75°C; Humidity: 58.2-61.8% |
Environment, warranty and package
| Operating Temperature | 0°C to 40°C (32°F to 104°F) |
|---|---|
| Storage Temperature | -20°C to 60°C (-5°F to 140°F) |
| Operating Humidity | 8% to 80% RH |
| Storage Humidity | 5% to 95% RH |
| Certification | | FCC; CE; BSMI; VCCI; RCM; EAC; CCC; KC; BIS |
| Warranty | 3-year hardware warranty, extendable to 5 years with extended warranty plus |
| Warranty notes | | The warranty period starts from the purchase date as stated on your purchase receipt.; | |
| Environment | RoHS Compliant |
| Packaging Content | | Main Unit X 1; Accessory Pack X 1; AC Power Cord X 1; RJ-45 LAN Cable X 2; Quick Installation Guide X 1 |
Frequently asked questions about the Synology DS1821+
What is the Synology DS1821+?
The Synology DS1821+ is a 8-bay scalable desktop NAS for growing small-business storage, centralised backup repositories, teams needing eight internal bays.
Which processor is in the Synology DS1821+?
It uses the AMD Ryzen V1500B with 4 cores at 2.2 GHz.
How much memory does the Synology DS1821+ include?
It includes 4 GB DDR4 ECC SODIMM and the supplied maximum memory capacity is 32 GB (16 GB × 2).
How many drive bays does the Synology DS1821+ have?
It has 8 internal drive bays and supports the supplied maximum of 18 (DX517 × 2).
Which drive types does the Synology DS1821+ support?
| 3.5" SATA HDD; 2.5" SATA HDD; 2.5" SATA SSD; M.2 2280 NVMe SSD. Confirm exact drive models on Synology’s compatibility list.
What networking is built into the Synology DS1821+?
The verified built-in network interfaces are 4 × 1GbE.
Can the Synology DS1821+ expand beyond its internal bays?
Yes. The verified maximum is 18 (DX517 × 2). Expansion units are sold separately.
Does the Synology DS1821+ include storage drives?
The supplied listing does not identify included storage drives. Confirm the package configuration before purchase.
What are the Synology DS1821+ dimensions?
It measures Not specified and weighs 6 kg.
What warranty applies to the Synology DS1821+?
Synology specifies 3-year hardware warranty, extendable to 5 years with extended warranty plus. Warranty-extension availability depends on region.
- Confirm exact drives, memory and accessories on Synology’s compatibility list for DS1821+.
- Expansion units required to reach 18 (DX517 × 2) are sold separately.
- M.2 SSD bays are not hot-swappable; confirm the supported SSD role and exact models before purchase.
- Actual usable capacity and performance depend on installed drives, storage configuration, workloads and network environment.
