Powerful, scalable, and versatile

Synology DS1621+ is a powerful and compact 6-bay network attached storage solution designed to store and protect critical data assets. Today’s growing amount of unstructured data requires smarter and increasingly higher performance methods of storing, accessing, and collaborating. Designed for scalability, the DS1621+ enables you to start small, then expand as your data grows.


Expand up to 16 drives with two DX517 expansion units


۱۱۰K, 174% higher 4K random read IOPS۱

Cache Acceleration

Dual M.2 2280 slots for NVMe Cache


AMD Ryzen
Quad-core 2.2 GHz

CPU Model AMD Ryzen V1500B
  CPU Quantity ۱
  CPU Architecture ۶۴-bit
  CPU Frequency ۴-core 2.2 GHz
  Hardware Encryption Engine (AES-NI)  
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)
  • 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 ۶
  Maximum Drive Bays with Expansion Unit ۱۶ (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* ۳
  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 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.
Size (Height x Width x Depth) ۱۶۶ mm x 282 mm x 243 mm
  Weight ۵.۱ kg
System Fan ۹۲ 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* ۲۵.۲ 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* ۵۱.۲۲ W (Access)
۲۵.۲۷ W (HDD Hibernation)
  British Thermal Unit ۱۷۴.۷۷ BTU/hr (Access)
۸۶.۲۲ 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 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
  • FCC
  • CE
  • BSMI
  • EAC
  • CCC
  • KC
  • VCCI
  • RCM
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)
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


Operating System(DSM)


Hardware Installation Guide




DiskStation DS1621+


۱۳-Reset button

۱۴-Expansion port

۱۵-PCIe expansion slot

۹-System fan

۱۰-Power port

۱۱-Kensington Security Slot

۱۲-۱GbE RJ-45 port

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