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Synology Network Attached Storage DS420j 4bay (Diskless) Retail
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Synology Network Attached Storage DS420j 4bay (Diskless) Retail

Synology Network Attached Storage DS420j 4bay (Diskless) Retail

$343.99
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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
Yes

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 suppliers 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
3.5" SATA HDD
2.5" SATA HDD
2.5" SATA SSD
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
"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.
The maximum single volume size is not directly related to the maximum raw capacity.

External Ports
RJ-45 1GbE LAN Port
1
USB 3.0 Port
2

File System
Internal Drives
EXT4
External Drives
EXT4
EXT3
FAT
NTFS
HFS+
exFAT
Note
sexFAT Access is purchased separately in Package Center.

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
Yes
Power Recovery
Yes
Noise Level
20.6 dB(A)
Scheduled Power On / Off
Yes
Wake on LAN / WAN
Yes
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)
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: 24.25-25.75oC, Humidity: 58.2-61.8%

Temperature
Operating Temperature
0oC to 40oC (32oF to 104oF)
Storage Temperature
-20oC to 60oC (-5oF to 140oF)
Relative Humidity
5% to 95% RH

Certification
FCC
CE
EAC
BSMI
VCCI
CCC
RCM

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
VS360HD
VS960HD
Surveillance Device License Pack

DSM Specifications

Storage Management
Maximum Internal Volume Number
64
Maximum iSCSI Target Number
10
Maximum iSCSI LUN
10
SSD TRIM
Yes
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

File Services
File Protocol
CIFS/AFP/NFS/FTP/WebDAV
Maximum Concurrent CIFS/AFP/FTP Connections
100
Windows Access Control List (ACL) Integration
Yes
NFS Kerberos Authentication
Yes

Account and 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
100

General Specifications
Networking Protocols
SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
Supported Browsers
Chrome
Firefox
Edge
Internet Explorer 10 onwards
Safari 10 onwards
Safari (iOS 10 onwards)
Chrome (Android 6.0 onwards)
Supported Language
English, Deutsch, Franais, Italiano, Espaol, Dansk, Norsk, Svenska, Nederlands, , Polski, Magyar, Portugus do Brasil, Portugus Europeu, Trke, esk, , , , ,

Add-on Packages

Synology Chat
Maximum Users
10
Notes
The number of concurrent HTTP connections for Synology Chat was configured to the maximum.
CPU and RAM usage were both under 80% when the number of maximum users was reached.

Download Station
Maximum Concurrent Download Tasks
80

exFAT Access (Optional)
Yes

Media Server
DLNA Compliance
Yes

Moments
Facial Recognition
Yes
Subject Recognition
Yes

Surveillance Station
Maximum IP cam
16 (including 2 Free License)
Total FPS (H.264)
480 FPS at 720p (1280x720)
288 FPS at 1080p (1920x1080)
150 FPS at 3M (2048x1536)
100 FPS at 5M (2591x1944)
70 FPS at 4K (3840x2160)
Total FPS (H.265)
480 FPS at 720p (1280x720)
384 FPS at 1080p (1920x1080)
256 FPS at 3M (2048x1536)
160 FPS at 5M (2591x1944)
100 FPS at 4K (3840x2160)
Total FPS (MJPEG)
240 FPS at 720p (1280x720)
150 FPS at 1080p (1920x1080)
100 FPS at 3M (2048x1536)
60 FPS at 5M (2591x1944)
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.
The maximum channel number also includes devices installed on Virtual DSM.
Total FPS may be affected by other services running at the same time (e.g., archive tasks performed by Archive Vault).

Synology Drive
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
Exceeding the limits above may result in longer response time in file operations.
EXT4 file system and non-encrypted shared folders were used during the aforementioned testing.

Synology Office
Maximum Users
200Notes
Multiple files were opened for testing and each file was edited by 30 users simultaneously.
CPU and RAM usage were both under 80% when the number of maximum users was reached.
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

VPN Server
Maximum Connections
10

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