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Synology DiskStation DS1821+ 8-Bay NAS Enclosure

Product Code: DS1821+ SKU: PCK10916 Categories: , , ,

Out of stock

  • 8 x 3.5″ / 2.5″ SATA Drive Bays
  • 2 x M.2 2280 NVMe SSD Slots
  • 2.2 GHz AMD Ryzen V1500B Quad-Core CPU
  • 4 x Gigabit Ethernet Ports
  • 4 x USB 3.1 Gen 1 Ports
  • 2 x eSATA Port
  • RAID 0, 1, 5, 6, 10, Hybrid, JBOD
  • PCIe 3.0 x8 Expansion Slot
  • Synology DSM Operating System

High-Performance NAS

The Synology DiskStation DS1821+ NAS enclosure is powered by a 2.2 GHz AMD Ryzen quad-core processor with 4GB of ECC DDR4 memory. It supports up to eight 3.5″ and 2.5″ SATA drives in RAID 0, 1, 5, 6, 10, Synology Hybrid, and JBOD modes with a maximum single volume size of 108TB.

Cache Acceleration

Installing up to two M.2 NVMe PCIe solid-state cache drives can accelerate hard drive array performance by over 20x.


The Synology DiskStation DS1821+ includes four Gigabit Ethernet ports with Link Aggregation and Failover support. Four USB 3.1 Gen 1 ports and two eSATA ports are available for connecting external storage drives and other devices to share across the network.


A PCIe 3.0 slot is available for expansions such as 10GbE network adapters for high-speed data transfers and backups. Connecting up to two Synology DX517 5-bay expansion units to the DiskStation DS1821+ provides you with a total of 18 drive bays. Up to 32GB of memory can be installed across two SO-DIMM slots to further boost NAS performance and efficiency.

File Management and Sharing

The web-based File Station tool is built with intuitive, drag-and-drop operations for fast and secure file management from Windows and Mac computers. Advanced search and filtering tools allow for easy organization and file sharing, and the DS1821+ supports AFP, FTP, iSCSI, NFS, SMB, and WebDAV protocols.

Certified Storage Virtualization

Synology iSCSI storage supports most virtualization solutions to enhance work efficiency. Support includes VMware vSphere 6 and VAAI integration to help offload storage operations and optimize computation efficiency. Additionally, Windows Offloaded Data Transfer (ODX) speeds up data transfer and migration rate and OpenStack Cinder support turns your Synology NAS into a block-based storage component.

Versatile Backup Solutions

The Synology DiskStation DS1821+ integrates a variety of backup applications to fit your needs, including Active Backup for Business, Hyper Backup, Synology Drive, and Active Backup for Microsoft 365 / G Suite.

Synology DSM Applications

  • The Synology Central Management System allows you to simultaneously manage multiple Synology NAS servers from a centralized interface.
  • Synology MailPlus provides a secure, reliable, and private mail server solution.
  • Quickly transition between clustered servers in the event of a server failure to minimize the impact on applications.
  • Comprehensive security tools are built-in and are continually updated to protect your devices against threats.
  • The Synology Drive application offers versatile tools for file management and synchronization.
  • With the Surveillance Station application, you have a complete solution for recording, monitoring, and
SKU: PCK10916 Categories: , , ,
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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)
  • 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.


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
  • 2.5″ SATA HDD
  • 2.5″ SATA SSD
  • M.2 2280 NVMe SSD
Maximum Single Volume Size* 108 TB
Hot Swappable Drive
  • “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.
  • Each internal volume (may consist of multiple drives) is expandable up to 108TB.

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
  • EXT4
External Drives
  • Btrfs
  • EXT4
  • EXT3
  • FAT
  • NTFS
  • HFS+
  • exFAT


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 100 V to 240 V 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)
  • 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


  • FCC
  • CE
  • BSMI
  • EAC
  • CCC
  • KC
  • VCCI
  • RCM
Notes The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)


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.