Designed for scalability and performance

The 8-bay Synology DS1821+ is aimed at IT enthusiast and SMB customers looking for a powerful and scalable storage solution, its business-grade backup solutions keep users safe and protected from potential data loss, while major improvements to compute capabilities and throughput means workloads are finished faster than ever before.

Scalability

Expand up to 18 drives
with two DX517 expansion units

Performance

۱۱۳K 4K random read IOPS۱

Cache Acceleration

Dual M.2 2280 slots for NVMe Cache

CPU

AMD Ryzen™
Quad-core 2.2 GHz

CPU
 CPU Model AMD Ryzen V1500B
  CPU Quantity ۱
  CPU Architecture ۶۴-bit
  CPU Frequency ۴-core 2.2 GHz
  Hardware Encryption Engine (AES-NI)  
Memory
 System Memory ۴ GB DDR4 ECC SODIMM
  Memory Module Pre-installed ۴ GB (4 GB x 1)
  Total Memory Slots ۲
  Maximum Memory Capacity ۳۲ GB (16 GB x 2)
  Notes
  • 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.
  • 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.
Storage
 Drive Bays ۸
  Maximum Drive Bays with Expansion Unit ۱۸ (DX517 x 2)
  M.2 Drive Slots ۲ (NVMe)
  Compatible Drive Type* (See all supported drives)
  • ۳.۵″ SATA HDD
  • ۲.۵″ SATA HDD
  • ۲.۵″ SATA SSD
  • M.2 2280 NVMe SSD
  Hot Swappable Drive  
  Notes “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 ۴ (with Link Aggregation / Failover support)
  USB 3.2 Gen 1 Port* ۴
  eSATA Port ۲
  Notes The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019.
PCIe
 PCIe Expansion ۱ x Gen3 x8 slot (x4 link)
File System
 Internal Drives
  • Btrfs
  • EXT4
  External Drives
  • Btrfs
  • EXT4
  • EXT3
  • FAT
  • NTFS
  • HFS+
  • exFAT
  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.
Appearance
 Size (Height x Width x Depth) ۱۶۶ mm x 343 mm x 243 mm
  Weight ۶ kg
Others
 System Fan ۱۲۰ 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* ۲۲.۲ dB(A)
  Scheduled Power On / Off  
  Wake on LAN / WAN  
  Power Supply Unit / Adapter ۲۵۰ W
  AC Input Power Voltage ۱۰۰V to 240V AC
  Power Frequency ۵۰/۶۰ Hz, Single Phase
  Power Consumption* ۵۹.۸ W (Access)
۲۶.۱۸ W (HDD Hibernation)
  British Thermal Unit ۲۰۴.۰۵ BTU/hr (Access)
۸۹.۳۳ 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%
Temperature
 Operating Temperature ۰°C to 40°C (32°F to 104°F)
  Storage Temperature -۲۰°C to 60°C (-5°F to 140°F)
  Relative Humidity ۵% to 95% RH
Certification
  • FCC
  • CE
  • BSMI
  • EAC
  • CCC
  • KC
  • VCCI
  • RCM
Warranty
 ۳-year hardware warranty, extendable to 5-year coverage – EW201
  Notes The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
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
Optional Accessories
  Notes All memory modules will operate at the maximum frequency specified by the CPU manufacturer.

Synology Assistant

Downloads

Operating System(DSM)

Downloads

Hardware Installation Guide

Downloads

Datasheet

Downloads

DiskStation DS1821+

 
 

۱۳-Expansion port

۱۴-۱GbE RJ-45 port

۱۵-Reset button

۱۶-USB 3.2 Gen 1 port

۹-Power port

۱۰-System fan

۱۱-PCIe expansion slot

۱۲-Kensington Security Slot

۵-Drive status indicator

۶-Drive tray

۷-Drive tray lock

۸-USB 3.2 Gen 1 port

۱-Status indicator

۲-Alert indicator

۳-Power button and indicator

۴-LAN indicator