Synology DiskStation DS1821+
Synology DiskStation DS1821+
Synology DiskStation DS1821+
Synology DiskStation DS1821+
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Synology DiskStation DS1821+

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High-capacity storage and data protection for anyone

Synology DS1821+8-bay DiskStation (up to 18-bay), Quad Core 2.2 GHz, 4GB RAM (up to 32GB), Built-in two M.2 NVMe SSD slots, 10GbE NIC support (optional) (drives not included)

Synology DiskStation DS1821+ is a powerful 8-bay network-attached-storage solution designed to store and protect missioncritical data. Designed to tackle increasing amounts of unstructured data, the low-noise desktop form-factor of the DS1821+ is built for both SOHO and SMB environments. With performance over 110K or 177% higher 4K random read IOPS than its predecessor, the DS1821+ is fast, with ample room for scalability.


  • Accelerated Performance
177% higher 4K random read IOPS and 76% faster
sequential write speeds compared to its predecessor

  • Maximize Performance
Turbocharge HDD arrays without occupying drive bays
using dual built-in M.2 slots for NVMe SSD cache

  • Expansion Made Easy
Scale up on demand to 18 drives with two DX517
expansion units

  • Includes Everything to Protect Your Data
Back up critical data from public clouds, PCs, servers,
VMs, and Synology NAS with Synology Active Backup
suite, Hyper Backup, and Snapshot Replication

  • Ready for 10/25GbE
Supports 10GbE SFP+/RJ-45 and 25GbE SFP28 NICs to
instantly increase network bandwidth based on your

Technical Specifications


CPU Model AMD Ryzen V1500B
  CPU Quantity 1
  CPU Architecture 64-bit
  CPU Frequency 4-core 2.2 GHz
  Hardware Encryption Engine (AES-NI)  


System Memory 4 GB DDR4 ECC SODIMM
  Memory Module Pre-installed 4 GB (4 GB x 1)
  Total Memory Slots 2
  Maximum Memory Capacity 32 GB (16 GB x 2)
  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.
For more information about the recommended memory configurations, please check the Hardware Installation Guide of your Synology product.


Drive Bays 8
  Maximum Drive Bays with Expansion Unit 18 (DX517 x 2)
  M.2 Drive Slots 2 (NVMe)
  Compatible Drive Type* (See all supported drives) 3.5" SATA HDD
M.2 2280 NVMe SSD
  Hot Swappable Drive*  
  Notes The hot swappable drive feature is not supported by M.2 SSD slots.
"Compatible drive type" indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.

External Ports

RJ-45 1GbE LAN Port 4 (with Link Aggregation / Failover support)
  USB 3.2 Gen 1 Port* 4
  eSATA Port 2
  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 x Gen3 x8 slot (x4 link)

File System

Internal Drives Btrfs
  External Drives Btrfs
  Notes exFAT Access can be installed for free from Package Center in DSM 7.0. In DSM 6.2 or earlier versions, exFAT Access needs to be purchased in Package Center.


Size (Height x Width x Depth) 166 mm x 343 mm x 243 mm
  Weight 6 kg


System Fan 120 mm x 120 mm x 2 pcs
  Fan Speed Mode Full-Speed Mode
Cool Mode
Quiet Mode
  Easy Replacement System Fan  
  Brightness Adjustable Front LED Indicators  
  Power Recovery  
  Noise Level* 22.2 dB(A)
  Scheduled Power On / Off  
  Wake on LAN / WAN  
  Power Supply Unit / Adapter 250 W
  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)
  British Thermal Unit 204.05 BTU/hr (Access)
89.33 BTU/hr (HDD Hibernation)
  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%


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




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