Secure cloud storage
Flexibly store up to 64 TB of data
Data sharing made easy
Safely share files and media over your private cloud for easier collaboration and better productivity.
Versatile video surveillance
Leverage intuitive surveillance tools to protect your premises and store footage from up to 16 IP cameras.
Create a private cloud hub for your data
Import and sync data scattered across PCs, Macs, phones, and external storage devices to implement well-organized file management for your business. Learn more
Multi-device access
Browse, access, edit, and share files securely and conveniently via desktop, mobile, or web browser platforms. Use intuitive admin tools to track and set file permissions and control access to documents, files, and other data.
On-demand sync
Save space on your personal devices by only synchronizing the files you need from your Synology system. Pin frequently accessed files for convenient offline accessibility.
Cloud integration
Sync your private storage servers with public cloud services such as Google Drive, Dropbox, and Microsoft OneDrive. Retain local copies of your cloud data for centralized management and data ownership. Learn more
Cross-platform sharing
Build a private data cloud that syncs and shares files swiftly between multiple storage servers, letting everyone access the same set of data at their convenience.
Versatile storage solution for essential needs
Manage and organize photos efficiently, back up and secure your digital data, and safeguard your physical premises with the DS420j.
Smart and secure photo management
Store and organize photos, albums, and other media with smart and intuitive features. Back up your memories with the mobile app, and leverage privacy-focused options to share media securely with friends, family, or colleagues. Learn more
Protect all your data
Safeguard your digital world and back up all your documents, files, photos, and more with license-free backup solutions.
Automatically back up memories and files
Safeguard mobile media such as photos and videos by automatically storing remote copies onto Synology Photos or Synology Drive.
Survive cyberattacks and prevent data leaks
Protect your data against ransomware attacks or accidental deletion with real-time or scheduled backups of computer folders with Synology Drive.
Intuitive video surveillance
Secure your home or business with a powerful solution to monitor, archive, and analyze footage centrally. Learn more
Wide device compatibility
Connect up to 16 IP cameras by selecting from a wide variety of over 8,300 validated models or ONVIF devices.
Access from anywhere
Monitor video streams in real time via web browsers, desktop clients, or mobile apps to protect your premises 24/7. Set up alerts and triggers to get notified of suspicious activity.
Multi-layered backup solutions
Leverage Synology solutions to back up all data stored on your DS420j onto a secondary server, external storage device, or the cloud.
Back up your Synology device, including system settings, applications, and shared folders, save space with data deduplication, and store copies to multiple destinations. Learn more
Works best with Synology drives
Engineered to handle intensive 24/7 workloads, Synology drives consistently deliver top-grade performance.
HDD
- 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
More ways to harness your NAS
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Hardware Specifications
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CPU
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CPU
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CPU Model | Realtek RTD1296 |
| CPU Quantity | 1 | |
| CPU Cores | 4 | |
| CPU Threads | 4 | |
| CPU Architecture | 64-bit | |
| CPU Frequency | 1.4 GHz | |
| Hardware Encryption Engine | ||
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Memory
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Memory
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System Memory | 1 GB DDR4 non-ECC |
| Notes | Synology may revise pre-installed memory module specifications in response to component lifecycle and supply conditions. All revised components undergo the same rigorous validation to ensure equivalent compatibility, stability, and performance. | |
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Storage
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Storage
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Drive Bays | 4 |
| Drive Type (See all supported drives) |
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| Hot Swappable Drive* | ||
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External Ports
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External Ports
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RJ-45 1GbE LAN Port | 1 |
| USB 3.2 Gen 1 Port | 2 | |
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Appearance
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Appearance
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Size (Height x Width x Depth) | 184 mm x 168 mm x 230 mm |
| Weight | 2.21 kg | |
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Others
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Others
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System Fan | 80 mm x 80 mm x 2 pcs |
| Fan Speed Mode |
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| 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 watts | |
| AC Input Power Voltage | 100V to 240V AC | |
| Power Frequency | 50/60 Hz, Single Phase | |
| Power Consumption |
21.71 watts (Access) 7.88 watts (HDD Hibernation) |
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| British Thermal Unit |
74.03 BTU/hr (Access) 26.87 BTU/hr (HDD Hibernation) |
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| Notes |
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Temperature
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Temperature
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Operating Temperature | 0°C to 40°C (32°F to 104°F) |
| Storage Temperature | -20°C to 60°C (-5°F to 140°F) | |
| Operating Humidity | 8% to 80% RH | |
| Storage Humidity | 5% to 95% RH | |
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Certification
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Certification
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Warranty
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Warranty
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2 Years | |
| Notes | The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more) | |
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Environment
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Environment
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RoHS Compliant | |
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Packaging Content
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Packaging Content
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Optional Accessories
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Optional Accessories
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Plus Series 3.5" SATA HDD: HAT3300 Series | |
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Compatibility
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Compatibility
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Synology Compatibility List | |
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DSM Specifications
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| Maximum Single Volume Size | 108 TB | |
| Maximum Internal Volume Number | 64 | |
| SSD TRIM | ||
| Supported RAID Type |
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| RAID Migration |
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| Volume Expansion with Larger HDDs |
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| Volume Expansion by Adding a HDD |
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| Global Hot Spare Supported RAID Type |
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| Notes |
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| Internal Drives |
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| External Drives |
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| File Protocol |
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| 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 | |
| Folder and Package Backup | ||
| Syslog Events per Second | 200 | |
| Supported Protocols | SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV | |
| Supported Browsers |
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| 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. | |
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Add-on Packages view the complete package list
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Download Station
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Download Station
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Maximum Concurrent Download Tasks | 80 |
| Maximum iSCSI Target Number | 10 | |
| Maximum LUN | 10 | |
| DLNA Compliance | ||
| Facial Recognition | ||
| Default Licenses | 2 (Additional cameras require purchase of licenses) | |
| Maximum IP Cameras and Total FPS (H.264) |
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| Maximum IP Cameras and Total FPS (H.265) |
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| Notes |
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| Recommended Number of Concurrent Sync Clients | 200 | |
| Maximum 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 |
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| Maximum Number of Users | 200 | |
| Notes | Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM | |
| Maximum Connections | 10 | |