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
DiskStation DS420j
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.
CPU
64-bit 4-core 1.4 GHz
Performance
Over 112 MB/s encrypted reading and writing1
Storage
Maximum 64 TB raw capacity
Energy-saving
7.88 W in hibernation mode
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.
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
Hyper Backup
Store multiple backup versions with block-level incremental data backup and cross-version deduplication.
Learn moreSurveillance Station
Complete surveillance solution for recording, monitoring, and management.
Learn more
- 1 Status indicator
- 2 LAN indicator
- 3 Power button and indicator
- 4 Drive status indicator
- 5 1GbE RJ-45 port
- 6 Power port
- 7 Kensington Security Slot
- 8 Fan
- 9 USB 3.0 port
- 10 Reset button
Notes:
- Performance figures may vary depending on environment, usage, and configuration.
Hardware Specifications |
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CPU |
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CPU |
CPU Model | Realtek RTD1296 |
| CPU Architecture | 64-bit | |
| CPU Frequency | Quad Core 1.4 GHz | |
| Hardware Encryption Engine | ||
Memory |
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Memory |
System Memory | 1 GB DDR4 |
| 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 |
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Storage |
Drive Bays | 4 |
| Compatible Drive Type* (See all supported drives) |
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| Maximum Internal Raw Capacity | 64 TB (16 TB drive x 4) (Capacity may vary by RAID types) | |
| Maximum Single Volume Size* | 108 TB | |
| Hot Swappable Drive | - | |
| Notes |
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External Ports |
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External Ports |
RJ-45 1GbE LAN Port | 1 |
| USB 3.0 Port | 2 | |
File System |
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File System |
Internal Drives |
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| External Drives |
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| Notes | exFAT Access is purchased separately in Package Center. | |
Appearance |
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Appearance |
Size (Height x Width x Depth) | 184 mm x 168 mm x 230 mm |
| Weight | 2.21 kg | |
Others |
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Others |
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 W | |
| AC Input Power Voltage | 100 V to 240 V AC | |
| Power Frequency | 50/60 Hz, Single Phase | |
| Power Consumption* |
21.71 W (Access) 7.88 W (HDD Hibernation) |
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| British Thermal Unit |
74.08 BTU/hr (Access) 26.89 BTU/hr (HDD Hibernation) |
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| Notes |
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Temperature |
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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 |
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Certification |
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Warranty |
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Warranty |
2 Years | |
| Notes | The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more) | |
Environment |
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Environment |
RoHS Compliant | |
Packaging Content |
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Packaging Content |
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Optional Accessories |
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Optional Accessories |
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DSM Specifications |
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Storage Management |
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Storage Management |
Maximum Internal Volume Number | 64 |
| Maximum iSCSI Target Number | 10 | |
| Maximum iSCSI LUN | 10 | |
| 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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File Services |
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File Services |
File Protocol | CIFS/AFP/NFS/FTP/WebDAV |
| Maximum Concurrent CIFS/AFP/FTP Connections | 100 | |
| Windows Access Control List (ACL) Integration | ||
| NFS Kerberos Authentication | ||
Account & Shared Folder |
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Account & Shared Folder |
Maximum Local User Accounts | 1,024 |
| Maximum Local Groups | 256 | |
| Maximum Shared Folder | 256 | |
| Maximum Shared Folder Sync Tasks | 4 | |
Log Center |
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Log Center |
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| Syslog Events per Second | 100 | |
General Specifications |
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General Specifications |
Networking 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 | |
Add-on Packages view the complete package list |
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Synology Chat |
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Synology Chat |
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| Maximum Users | 10 | |
| Notes |
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Download Station |
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Download Station |
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| Maximum Concurrent Download Tasks | 80 | |
exFAT Access (Optional) |
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exFAT Access (Optional) |
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Media Server |
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Media Server |
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| DLNA Compliance | ||
Moments |
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Moments |
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| Facial Recognition | ||
| Subject Recognition | ||
Surveillance Station |
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Surveillance Station |
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| 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) |
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| Total FPS (H.265)* |
480 FPS @ 720p (1280x720) 384 FPS @ 1080p (1920x1080) 256 FPS @ 3M (2048x1536) 160 FPS @ 5M (2591x1944) 100 FPS @ 4K (3840x2160) |
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| Total FPS (MJPEG)* |
240 FPS @ 720p (1280x720) 150 FPS @ 1080p (1920x1080) 100 FPS @ 3M (2048x1536) 60 FPS @ 5M (2591x1944) |
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| Notes | Surveillance Station throughput is tested with Axis network camera, using continuous recording with live view from Surveillance Station and motion detection by camera. Live view and recording are sharing the same stream from the camera. | |
Synology Drive |
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Synology Drive |
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| Recommended Number of Hosted Files | 100,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above) | |
| Recommended Number of Concurrent Sync Clients | 200 (the number of connections that can be maintained when the recommended number of hosted files was reached) | |
| Notes |
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Synology Office |
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Synology Office |
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| Maximum Users | 200 | |
| Notes |
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Video Station |
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Video Station |
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| Video Transcoding | Group 2 (See more) | |
VPN Server |
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VPN Server |
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| Maximum Connections | 10 | |
Notes:
- Model specifications are subject to change without prior notice.
- The figures are based on Synology internal testing. No other services or applications are processed during the performance tests.