Performance Compatibility Downloads Compare

DiskStation DS120j

Your personal cloud solution for effortless data management.

An ideal first NAS for everyone

DS120j is a centralized storage solution that allows you to share family photos and videos to all household devices, such as computers and mobile phones.

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Fast Performance

Over 112 MB/s sequential reading

Eco-friendly

9.81 watts under full operation

Seamless integration with your mobile devices

Synology mobile applications are designed to allow quick and secure access to your data wherever you are.

Centralized backup solution for your digital devices

Synology's comprehensive multi-version backup solution protects your digital assets on computers (Windows/Mac) and mobile phones (Android/iOS) against malicious attacks, including the rising encryption-based ransomware threats.

Easy file access with QuickConnect

Access files on your Synology NAS over the Internet without the hassle of setting up port forwarding rules, DDNS, or other complicated network settings. QuickConnect allows you to connect via a secure, customizable address, so that you can instantly access media and work files on any Internet-connected device with no additional charge.

Powered by Synology DSM

File Server/Management

Powerful built-in file management and sharing services.

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Multimedia

Complete multimedia solution for management, streaming, and playback.

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Hyper Backup

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

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DSM UI

Award-winning operating system with an intuitive user interface and powerful capabilities.

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Security

Comprehensive built-in security tools are constantly updated to protect your devices against evolving threats.

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All-in-one server

Save additional investment by integrating various network services, web/mail services, management applications into your NAS.

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  • 1 Status indicator
  • 2 LAN indicator
  • 3 Drive status indicator
  • 4 Power button and indicator
  • 5 System fan
  • 6 USB 2.0 port
  • 7 Kensington Security Slot
  • 8 Reset button
  • 9 1GbE RJ-45 port
  • 10 Power port
  • Hardware Specs
  • Software Specs

Hardware Specifications

CPU

CPU

 CPU Model Marvell Armada 3700 88F3720
CPU Architecture 64-bit
CPU Frequency 2-core 800 MHz
Hardware Encryption Engine

Memory

Memory

 System Memory 512 MB DDR3L 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

Storage

 Drive Bays 1
Compatible Drive Type* (See all supported drives)
  • 3.5" SATA HDD
  • 2.5" SATA HDD (with optional 2.5" Disk Holder)
Maximum Single Volume Size* 108 TB
Hot Swappable Drive -
Notes
  • Storage Pool and volume creation require all drives to be listed as compatible on the device model's compatibility list.
  • "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

External Ports

 RJ-45 1GbE LAN Port 1
USB 2.0 Port 2

File System

File System

 Internal Drives
  • EXT4
External Drives
  • EXT4
  • EXT3
  • FAT
  • NTFS
  • HFS+
  • exFAT*
Notes exFAT Access is purchased separately in Package Center.

Appearance

Appearance

 Size (Height x Width x Depth) 166 mm x 71 mm x 224 mm
Weight 0.7 kg

Others

Others

 System Fan 60 mm x 60 mm x 1 pcs
Fan Speed Mode
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
  • Low-power Mode
Power Recovery
Noise Level* 16.9 dB(A)
Scheduled Power On / Off
Wake on LAN / WAN
Power Supply Unit / Adapter 36 W
AC Input Power Voltage 100 V to 240 V AC
Power Frequency 50/60 Hz, Single Phase
Power Consumption* 9.81 W (Access)
4.68 W (HDD Hibernation)
British Thermal Unit 33.47 BTU/hr (Access)
15.97 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

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

Certification
  • EAC
  • CCC
  • KC
  • FCC
  • CE
  • BSMI
  • VCCI
  • RCM

Warranty

Warranty

 2 Years
Notes The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)

Environment

Environment

 RoHS Compliant

Packaging Content

Packaging Content
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Adapter X 1
  • RJ-45 LAN Cable X 1
  • Quick Installation Guide X 1

Optional Accessories

Optional Accessories
  • VisualStation: VS960HD/VS360HD
  • Surveillance Device License Pack
  • Disk Holder: Type C

DSM Specifications

Storage Management

Storage Management

 Maximum Internal Volume Number 1
SSD TRIM
Supported RAID Type Basic

File Services

File Services

 File Protocol CIFS/AFP/NFS/FTP/WebDAV
Maximum Concurrent CIFS/AFP/FTP Connections 50
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

Account & Shared Folder

 Maximum Local User Accounts 512
Maximum Local Groups 128
Maximum Shared Folder 256
Maximum Shared Folder Sync Tasks 2

Log Center

Log Center
Syslog Events per Second 50

General Specifications

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
  • Internet Explorer 10 onwards
  • Safari 10 onwards
  • Safari (iOS 10 onwards)
  • Google Chrome (Android 6.0 onwards)
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

Download Station

Download Station
Maximum Concurrent Download Tasks 50

exFAT Access (Optional)

exFAT Access (Optional)

iSCSI Manager

iSCSI Manager

 Maximum iSCSI Target Number 10
Maximum iSCSI LUN 10

Media Server

Media Server
DLNA Compliance

Moments

Moments
Notes The following features of Moments are not supported on this model: facial recognition, subject recognition, Auto Color & Rotate, and Moments Select.

Surveillance Station

Surveillance Station
Maximum IP cam (Licenses required) 5 (including 2 Free License) (See All Supported IP Cameras)
Total FPS (H.264) 150 FPS @ 720p (1280x720)
120 FPS @ 1080p (1920x1080)
70 FPS @ 3M (2048x1536)
40 FPS @ 5M (2591x1944)
20 FPS @ 4K (3840x2160)
Total FPS (H.265) 150 FPS @ 720p (1280x720)
150 FPS @ 1080p (1920x1080)
130 FPS @ 3M (2048x1536)
65 FPS @ 5M (2591x1944)
30 FPS @ 4K (3840x2160)
Total FPS (MJPEG) 50 FPS @ 720p (1280x720)
50 FPS @ 1080p (1920x1080)
40 FPS @ 3M (2048x1536)
40 FPS @ 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

Synology Drive
Recommended Number of Hosted Files 10,000 (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 5 (the number of connections that can be maintained when the recommended number of hosted files was reached)
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.

Video Station

Video Station
Video Transcoding Group 2 (See more)

VPN Server

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 above recommended specifications, please contact us.