Refurbished DiskStation DS120j

Your personal cloud solution for effortless data management.

Synology Certified Refurbished

Access Synology solutions in a cost-effective and environmentally responsible way. All certified refurbished products are put through extensive testing, comply with stringent quality standards, and come with a 2-year warranty.

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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

Productivity in the private cloud

DS120j is designed for professionals to share, sync, and work together more efficiently.

Anytime, anywhere access

Access, manage, and share your files and media from anywhere with Synology Drive. Available on PC, Mac, Linux, Chromebook, Android, iOS, or any device equipped with a browser.

Intelligent backup and syncing

Safeguard against ransomware attacks or accidental deletion with real-time or scheduled folder backups. Reduce local storage use with on-demand sync, only downloading files as needed.

Seamless cloud syncing

Synchronize files between your DS120j and public cloud services using Synology Cloud Sync. Retain local backup copies of data stored on Google Drive, Dropbox, Microsoft OneDrive, and more, and ensure data ownership.

Sync up with teams, even at the edge

Automatically keep data synchronized between Synology systems in different locations with Synology Drive ShareSync to improve cross-site workflows.

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 at no additional charge.

Powered by Synology DiskStation Manager

File Server/Management

Powerful built-in file management and sharing services.

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Public Cloud Integration

Back up and synchronize data easily between public cloud accounts and your NAS.

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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

Shield your Synology NAS from the most sophisticated threats with industry-leading security solutions.

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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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Works best with Synology drives

Engineered to handle intensive 24/7 workloads, Synology drives consistently deliver top-grade performance.

HDD

Plus Series 3.5" SATA

Hardware Overview

1Status indicator
2LAN indicator
3Drive status indicator
4Power button and indicator
5System fan

6USB 2.0 port
7Kensington Security Slot
8Reset button
91GbE RJ-45 port
10Power port

Hardware Specs

Software Specs

Hardware Specifications
CPU
CPU	CPU Model	Marvell Armada 3700 88F3720
	CPU Quantity	1
	CPU Core	2
	CPU Architecture	64-bit
	CPU Frequency	800 MHz
	Hardware Encryption Engine
Memory
Memory	System Memory	512 MB DDR3 non-ECC
	Notes	Synology may revise pre-installed memory module specifications in response to component lifecycle and supply conditions. All revised components undergo the same rigorous validation to ensure equivalent compatibility, stability, and performance.
Storage
Storage	Drive Bays	1
	Drive Type (See all supported drives)	3.5" SATA HDD 2.5" SATA HDD (with optional 2.5" Disk Holder)
	Hot Swappable Drive*	-
External Ports
External Ports	RJ-45 1GbE LAN Port	1
	USB 2.0 Port	2
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 watts
	AC Input Power Voltage	100V to 240V AC
	Power Frequency	50/60 Hz, Single Phase
	Power Consumption	9.81 watts (Access) 4.68 watts (HDD Hibernation)
	British Thermal Unit	33.45 BTU/hr (Access) 15.96 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)
	Operating Humidity	8% to 80% RH
	Storage Humidity	5% to 95% RH
Certification
Certification	EAC CCC KC BIS 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	Plus Series 3.5" SATA HDD: HAT3300 Series Disk Holder: Type C

DSM Specifications
Storage Management
Storage Management	Maximum Single Volume Size	108 TB
	Maximum Internal Volume Number	1
	SSD TRIM
	Supported RAID Type	Basic
	Notes	Actual maximum storage pool and volume sizes depend on drive sizes used, the number of drive bays available, and the RAID configuration. 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.
File System
File System	Internal Drives	ext4
	External Drives	ext4 ext3 FAT32 NTFS HFS+ exFAT
File Services
File Services	File Protocol	SMB AFP NFS FTP WebDAV Rsync
	Maximum Concurrent SMB/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
Hyper Backup
Hyper Backup	Folder and Package Backup
Log Center
Log Center	Syslog Events per Second	100
General Specifications
General Specifications	Supported Protocols	SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
	Supported Browsers	Chrome Firefox 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
Download Station
Download Station	Maximum Concurrent Download Tasks	50
SAN Manager
SAN Manager	Maximum iSCSI Target Number	10
	Maximum LUN	10
Media Server
Media Server	DLNA Compliance
Synology Photos
Synology Photos	Notes	Facial recognition is unavailable on this model.
Surveillance Station
Surveillance Station	Default Licenses	2 (Additional cameras require purchase of licenses)
	Maximum IP Cameras and Total FPS (H.264)	1080p: 5 channels, 120 FPS 3M: 5 channels, 70 FPS 5M: 4 channels, 40 FPS 4K: 2 channels, 20 FPS
	Maximum IP Cameras and Total FPS (H.265)	1080p: 5 channels, 150 FPS 3M: 5 channels, 130 FPS 5M: 5 channels, 65 FPS 4K: 3 channels, 30 FPS
	Notes	Performance figures are obtained from testing conducted with the device fully populated with drives, with their default memory configuration, and under a continuous recording setup. Actual system capabilities may vary based on configuration, drive performance, enabled features, and the presence of additional workloads. Use NVR Selector to quickly find a suitable model based on your requirements. The number of video channels that can be viewed simultaneously is double the maximum number of cameras for the same codec and resolution.
Synology Drive
Synology Drive	Recommended Number of Concurrent Sync Clients	5
	Maximum 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.
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 specifications above, please contact our regional partners for professional advice.