Synology DiskStation DS420j Hardware Specs

CPU	CPU Model	Realtek RTD1296
	CPU Quantity	1
	CPU Architecture	64-bit
	CPU Frequency	4-core 1.4 GHz
	Hardware Encryption Engine
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	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	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	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	Size (Height x Width x Depth)	184 mm x 168 mm x 230 mm
	Weight	2.21 kg
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	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	EAC CCC FCC CE BSMI VCCI RCM
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	RoHS Compliant
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	VisualStation: VS360HD Surveillance Device License Pack

Notes:

Model specifications are subject to change without prior notice.
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.
The actual performance may be lower than lab testing figure due to differences in server configuration, deployment, and the number of active operations.
If usage requirements exceed the specifications above, please contact our regional partners for professional advice.

Synology DiskStation DS420j Software Specs

DSM Specifications
Storage Management	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 Services	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.
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	Syslog Events per Second	200
General Specifications	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.
Add-on Packages view the complete package list
Synology Chat	Maximum Users	10
	Notes	When applicable, systems are tested configured with maximum memory and set to allow the maximum number of connections.
Download Station	Maximum Concurrent Download Tasks	80
SAN Manager	Maximum iSCSI Target Number	10
	Maximum LUN	10
	Notes	iSCSI Manager has been renamed to SAN Manager in DSM 7.0.
Media Server	DLNA Compliance
Synology Photos	Facial Recognition
Surveillance Station	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.
Synology Drive	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.
Synology Office	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 Station	Video Transcoding	Group 2 (See more)
VPN Server	Maximum Connections	10

Notes:

Model specifications are subject to change without prior notice.
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.
The actual performance may be lower than lab testing figure due to differences in server configuration, deployment, and the number of active operations.
If usage requirements exceed the specifications above, please contact our regional partners for professional advice.

Description

Synology DiskStation DS420j

An essential entry-level NAS for your home

Build a private cloud for your home

Synology DiskStation DS420j is a 4-bay desktop NAS designed for home data backup, file syncing, and sharing. You can easily centralize all your multimedia collections with its support of up to 64 TB raw capacity.

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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

Manage your photo collections

Manage your photos efficiently with automated tools to group, filter, organize, and share. All while keeping your memories safe and secure. Learn more

Stream content to your TV

Turn your Synology DiskStation DS420j NAS into a home media hub and stream your digital content to 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.

Access and sync your files seamlessly

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 with scheduled backups 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 data from various source folders, including external USB drives, another Synology DiskStation DS420j NAS, sync servers, or 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 DiskStation Manager

Multimedia

Complete multimedia solution for management, streaming, and playback.

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Desktop Backup

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

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File Server/Management

Powerful built-in file management and sharing services.

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Synology Drive

Instantly access your NAS files across multiple devices whenever you want, wherever you are.

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Hyper Backup

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

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Surveillance

Protect your home or business with intelligent monitoring and video management tools.

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