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
An essential entry-level NAS 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.
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
Organize your photos intelligently with Moments, a modern, AI-enabled photo management application that lets you effortlessly preserve your precious memories. Learn more
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.
Synology mobile applications are designed to allow quick and secure access to your data wherever you are.
Synology mobile applications are designed to allow quick and secure access to your data wherever you are.
Synology Drive provides a built-in universal portal to access your data anytime and anywhere, and synchronize all your files across platforms, including Windows, macOS, Linux, Android, and iOS. Learn more
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.
Instantly access your NAS files across multiple devices whenever you want, wherever you are.
Learn moreStore multiple backup versions with block-level incremental data backup and cross-version deduplication.
Learn moreComplete surveillance solution for recording, monitoring, and management.
Learn moreNotes:
Hardware Specifications |
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CPU |
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CPU |
CPU Model | Realtek RTD1296 |
CPU Quantity | 1 | |
CPU Architecture | 64-bit | |
CPU Frequency | 4-core 1.4 GHz | |
Hardware Encryption Engine | ||
Memory |
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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 |
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Storage |
Drive Bays | 4 |
Compatible Drive Type* (See all supported drives) |
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Maximum Single Volume Size* | 108 TB | |
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 |
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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 |
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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 |
DSM Specifications |
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Storage Management |
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Storage Management |
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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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 | ||
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. | |
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 | The number of concurrent HTTP connections for Synology Chat was configured to the maximum. | |
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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iSCSI Manager |
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iSCSI Manager |
Maximum iSCSI Target Number | 10 |
Maximum iSCSI LUN | 10 | |
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 |
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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: