DiskStation DS420j

An essential entry-level NAS for your home

DS420j
DS420j
CPU

CPU

64-bit 4-core 1.4 GHz

Performance

Performance

Over 112 MB/s encrypted reading and writing1

Storage

Storage

Maximum 64 TB raw capacity

Energy-saving

Energy-saving

7.88 W in hibernation mode

Synology

Manage your photo collections

Organize your photos intelligently with Moments, a modern, AI-enabled photo management application that lets you effortlessly preserve your precious memories. Learn more

Stream content to your TV

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

Apple TV
Android TV
Samsung TV

Seamless integration with your mobile devices

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

DS audio
Photos
DS video
Synology

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

Reliable and efficient backup options

Powered by Synology DiskStation Manager

DiskStation DS420j

product DS420j front view photo
product DS420j back view photo
  • 1Status indicator
  • 2LAN indicator
  • 3Power button and indicator
  • 4Drive status indicator
  • 51GbE RJ-45 port
  • 6Power port
  • 7Kensington Security Slot
  • 8System fan
  • 9USB 3.0 port
  • 10Reset button

Notes:

  1. Performance figures may vary depending on environment, usage, and configuration.
Hardware Specifications
CPU
CPU
CPU Model Realtek RTD1296
CPU Quantity 1
CPU Architecture 64-bit
CPU Frequency 4-core 1.4 GHz
Hardware Encryption Engine
Memory
Memory
System Memory 1 GB DDR4 non-ECC
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.
Storage
Storage
Drive Bays 4
Compatible Drive Type* (See all supported drives)
  • 3.5" SATA HDD
  • 2.5" SATA HDD
  • 2.5" SATA 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
External Ports
RJ-45 1GbE LAN Port 1
USB 3.2 Gen 1 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.
File System
File System
Internal Drives
  • EXT4
External Drives
  • 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
Appearance
Size (Height x Width x Depth) 184 mm x 168 mm x 230 mm
Weight 2.21 kg
Others
Others
System Fan 80 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 / Adapter 90 W
AC Input Power Voltage 100V to 240V AC
Power Frequency 50/60 Hz, Single Phase
Power Consumption 21.71 W (Access)
7.88 W (HDD Hibernation)
British Thermal Unit 74.08 BTU/hr (Access)
26.89 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
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
Certification
  • EAC
  • CCC
  • FCC
  • CE
  • BSMI
  • VCCI
  • RCM
Warranty
Warranty
2-year hardware warranty, extendable to 4 years with Extended Warranty Plus
Notes
  • Availability varies by region. Before purchasing, please visit the official web pages of EW201/202 and Extended Warranty Plus for a list of eligible regions.
  • The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
Environment
Environment
RoHS Compliant
Packaging Content
Packaging Content
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Adapter X 1
  • AC Power Cord X 1
  • RJ-45 LAN Cable X 1
  • Quick Installation Guide X 1
Optional Accessories
Optional Accessories
  • VisualStation: VS360HD
  • Surveillance Device License Pack
DSM Specifications
Maximum Single Volume Size* 108 TB
Maximum Internal Volume Number 64
SSD TRIM
Supported RAID Type
  • Synology Hybrid RAID
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
RAID Migration
  • Basic to RAID 1
  • Basic to RAID 5
  • RAID 1 to RAID 5
  • RAID 5 to RAID 6
Volume Expansion with Larger HDDs
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
Volume Expansion by Adding a HDD
  • Synology Hybrid RAID
  • JBOD
  • RAID 5
Global Hot Spare Supported RAID Type
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
Notes
  • Usable capacity for each volume will be lower than the maximum volume size and is dependent on the filesystem and the amount of system metadata stored.
  • Actual maximum storage pool and volume sizes depend on drive sizes used, the number of drive bays available, and the RAID configuration.
File Protocol SMB/AFP/NFS/FTP/WebDAV
Maximum Concurrent SMB/AFP/FTP Connections 100
Windows Access Control List (ACL) Integration
NFS Kerberos Authentication
Notes The testing standard was based on the maximum number of concurrent connections supported by this model. During the testing, 25% of the connections were used to transfer files concurrently. The transfer process guaranteed that the connections were not interrupted; the minimum transfer speed was not guaranteed.
Maximum Local User Accounts 1,024
Maximum Local Groups 256
Maximum Shared Folder 256
Maximum Shared Folder Sync Tasks 4
Syslog Events per Second 200
Networking Protocols SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
Supported Browsers
  • Google Chrome
  • Firefox
  • Microsoft Edge
  • Safari
Supported Language English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文
Notes For an updated list of supported browser versions, check the DSM Technical Specifications.
Maximum Users 10
Notes When applicable, systems are tested configured with maximum memory and set to allow the maximum number of connections.
Download Station
Download Station
Maximum Concurrent Download Tasks 80
Maximum iSCSI Target Number 10
Maximum LUN 10
Notes iSCSI Manager has been renamed to SAN Manager in DSM 7.0.
DLNA Compliance
Facial Recognition
Maximum IP cam (Licenses required) 16 (including 2 Free License) (see all supported IP cameras)
Total FPS (H.264) 480 FPS @ 720p (1280x720)
288 FPS @ 1080p (1920x1080)
150 FPS @ 3M (2048x1536)
100 FPS @ 5M (2591x1944)
70 FPS @ 4K (3840x2160)
Total FPS (H.265) 480 FPS @ 720p (1280x720)
384 FPS @ 1080p (1920x1080)
256 FPS @ 3M (2048x1536)
160 FPS @ 5M (2591x1944)
100 FPS @ 4K (3840x2160)
Total FPS (MJPEG) 240 FPS @ 720p (1280x720)
150 FPS @ 1080p (1920x1080)
100 FPS @ 3M (2048x1536)
60 FPS @ 5M (2591x1944)
Notes
  • Maximum IP cameras and FPS figures are tested with the device fully populated with drives and under a continuous recording setup.
  • Actual system capabilities may differ depending on system configuration, drive performance, number of features enabled, and if additional workloads are present.
Recommended Number of Concurrent Sync Clients 200 (the number of connections that can be maintained when the recommended number of hosted files was reached)
Recommended Number of Hosted Files 500,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)
Notes
  • Exceeding the recommended numbers above will not block application operations, but may result in longer response time.
  • EXT4 file system and non-encrypted shared folders were used during the aforementioned testing.
Maximum Users 200
Notes
  • Multiple files were opened for testing and each file was edited by 30 users simultaneously.
  • Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
Video Transcoding Group 2 (See more)
Maximum Connections 10

Notes:

  1. Model specifications are subject to change without prior notice.
  2. The figures are based on Synology internal testing. Each performance test is done individually. No other services or applications are processed at the same time.
  3. The actual performance may be lower than lab testing figure due to differences in server configuration, deployment, and the number of active operations.
  4. If usage requirements exceed the specifications above, please contact our regional partners for professional advice.