Synology DiskStation DS420j, 4-bay NAS Server for Personal/Home, CPU QuadCore 1.4GHz, 1GB DDR4, 4 x 3.5" or 2.5" SATA3, 2xUSB 3.0, Gigabit LAN (retelistica NAS pentru HDD/сетевой дисковый накопитель для HDD)

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DiskStation DS420j

An essential entry-level NAS for your home


Build a private cloud for your home

DS420j is a 4-bay desktop NAS designed for home data backup, file syncing, and sharing.
Supporting up to 64 TB raw capacity, you can easily centralize all your multimedia collections.

Download Datasheet


64-bit 4-core 1.4 GHz


Over 112 MB/s encrypted reading and writing1


Maximum 64 TB raw capacity


7.88 W in hibernation mode

Manage your photo collections

Smartly organize your photos with Synology Moments, a modern,
AI-enabled photo management application that allows you to preserve your precious memories effortlessly. Learn more


Stream content to your TV

Turn your Synology NAS into a home media hub and stream your digital contents to
your favorite devices such as computers, mobile devices, Samsung TV, Apple TV, Google Chromecast, and DLNA devices.

Seamless integration with your mobile devices

Synology mobile applications are designed to allow quick and secure access to your data wherever you are.

Seamless integration with your mobile devices

Synology mobile applications are designed to allow quick and secure access to your data wherever you are.


Cross-platform file syncing and sharing

Synology Drive allows you to sync files across Windows, macOS, Linux, and mobile devices, keeping everything up-to-date.


Sync files on demand: Save the storage space and network bandwidth of your PC.


Go back in time: Easily retrieve previous versions of your shared files.


Back up your data: Protect your files as scheduled or in real-time.


Reliable and efficient backup options

Synology Hyper Backup is a reliable and multi-directional backup solution offering data deduplication and compression.
You can back up from various source folders, including external USB drives, another
Synology NAS, rsync servers, or from public cloud services like Google Drive or Synology C2,
and protect your data against malicious attacks and encryption-based ransomware threats. Learn more

Powered by Synology DSM

Complete multimedia solution for management, streaming, and playback.

Desktop Backup
Simplified backup solution for your Mac, PC, and mobile devices.

File Server/Management
Powerful built-in file management and sharing services.

Synology Drive
A versatile solution for file management and synchronization.

Hyper Backup
Store multiple backup versions with block-level incremental data backup and cross-version deduplication.

Surveillance Station
Complete surveillance solution for recording, monitoring, and management.

  • 1Status indicator

  • 2LAN indicator

  • 3Power button and indicator

  • 4Drive status indicator

  • 51GbE RJ-45 port

  • 6Power port

  • 7Kensington Security Slot

  • 8Fan

  • 9USB 3.0 port

  • 10Reset button


CPU ModelRealtek RTD1296
 CPU Architecture64-bit
 CPU FrequencyQuad Core 1.4 GHz
 Hardware Encryption Engine 


System Memory1 GB DDR4
 NotesSynology 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 Bays4
 Compatible Drive Type* (See all supported drives)

  • 3.5" SATA HDD

  • 2.5" SATA HDD

  • 2.5" SATA SSD

 Maximum Internal Raw Capacity64 TB (16 TB drive x 4) (Capacity may vary by RAID types)
 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.

  • The maximum single volume size is not directly related to the maximum raw capacity. (Learn more)

External Ports

RJ-45 1GbE LAN Port1
 USB 3.0 Port2

File System

Internal Drives

  • EXT4

 External Drives

  • EXT4

  • EXT3

  • FAT

  • NTFS

  • HFS+

  • exFAT*

 NotesexFAT Access is purchased separately in Package Center.


Size (Height x Width x Depth)184 mm x 168 mm x 230 mm
 Weight2.21 kg


System Fan80 mm x 80 mm x 2 pcs
 Fan Speed Mode

  • Full-Speed Mode

  • Cool Mode

  • Quiet Mode

  • Low-power Mode

 Brightness Adjustable Front LED Indicators 
 Power Recovery 
 Noise Level*20.6 dB(A)
 Scheduled Power On / Off 
 Wake on LAN / WAN 
 Power Supply Unit / Adapter90 W
 AC Input Power Voltage100 V to 240 V AC
 Power Frequency50/60 Hz, Single Phase
 Power Consumption*21.71 W (Access)
7.88 W (HDD Hibernation)
 British Thermal Unit74.08 BTU/hr (Access)
26.89 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 Temperature0°C to 40°C (32°F to 104°F)
 Storage Temperature-20°C to 60°C (-5°F to 140°F)
 Relative Humidity5% to 95% RH