Synology DiskStation DS1621xs+
Synology DiskStation DS1621xs+
Synology DiskStation DS1621xs+
Synology DiskStation DS1621xs+
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Synology DiskStation DS1621xs+

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  On-Premises Cloud Solution Built for Performance
Synology DiskStation DS1621xs+ is a highend, high-performance NAS solution that supports every aspect of your business with powerful data management, collaboration, and networking tools topped off with wellrounded data protection mechanisms in a 6-bay desktop chassis. Built-in M.2 SSD cache slots, 10GbE connectivity, scalable storage, and Synology 5-year limited warranty make DS1621xs+ a future-proof choice to build onpremises cloud infrastructure. 


  • Built for High-Speed Connectivity
Combine built-in 10GbE and optional high-speed NIC
for over 3,100 MB/s sequential read performance1
  • Boost Performance With SSD Cache
Built-in M.2 2280 NVMe SSD slots permit cache
acceleration without using storage drive bays
  • Flexibly Expand Storage Size
Flexibly scale up to 16 drives2 to increase storage
capacity as demand grows
  • Collaboration and Productivity Suite
Build an on-premises, multi-user collaboration
environment with fine-grained controls
  • Protect and Restore Data in a Snap
Back up critical data and reduce your Recovery Time
Objective (RTO) with Snapshot Replication
  • Leverage Native Virtualization Tools
Use virtualization storage tools to complete your SAN
or run virtual machines on a full-featured hypervisor
  • Fully Back Up Business Assets
Back up company data from PCs, public cloud, company
servers, and virtual machines.

Technical Specifications

CPU CPU Model Intel Xeon D-1527

CPU Quantity 1

CPU Architecture 64-bit

CPU Frequency 4-core 2.2 (base) / 2.7 (turbo) GHz

Hardware Encryption Engine (AES-NI)
Memory System Memory 8 GB DDR4 ECC SODIMM

Memory Module Pre-installed 8 GB (8 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 on the recommended memory configurations, visit here.
Storage Drive Bays 6

Maximum Drive Bays with Expansion Unit 16 (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 2 (with Link Aggregation / Failover support)

RJ-45 10GbE LAN Port 1

USB 3.2 Gen 1 Port* 3

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 PCIe Expansion 1 x Gen3 x8 slot (x8 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.
Appearance Size (Height x Width x Depth) 166 mm x 282 mm x 243 mm

Weight 5.3 kg
Others System Fan 92 mm x 92 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* 25.2 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 62.85 W (Access)
34.26 W (HDD Hibernation)

British Thermal Unit 214.45 BTU/hr (Access)
116.89 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 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
Certification FCC