QNAP TS-351 3-Bay NAS Enclosure

BH #QNTS3514GUS • MFR #TS-351-4G-US
QNAP TS-351 3-Bay NAS Enclosure
Key Features
  • 4 x 3.5" SATA Bays | 2 x M.2 2280 Slots
  • 2.41 GHz Intel Celeron J1800 Dual-Core
  • 1 x Gigabit Ethernet Port
The TS-351 3-Bay NAS Enclosure from QNAP combines media center functionality with efficient auto-tired storage and RAID functionality to provide improved data protection, system performance, and storage utilization. With the ability to stream and share photos, music, and videos throughout your home and beyond using HDMI, the TS-351 and its minimalist design can fit into your workspace as a digital hub.
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QNAP TS-351 Overview

The TS-351 3-Bay NAS Enclosure from QNAP combines media center functionality with efficient auto-tired storage and RAID functionality to provide improved data protection, system performance, and storage utilization. With the ability to stream and share photos, music, and videos throughout your home and beyond using HDMI, the TS-351 and its minimalist design can fit into your workspace as a digital hub.

The TS-351 is powered by a 2.41 GHz Intel Celeron J1800 Dual-Core processor and 4GB DDR3L RAM, which can be upgraded to 8GB by using one 4GB module in each of the two SO-DIMM slots. Network connectivity is achieved using the Gigabit Ethernet port. This NAS also supports JBOD and a variety of RAID modes, including RAID 0, 1, and 5, each of which offers data redundancy, speed, or a combination of both.

This 3-bay enclosure has the ability to natively house both 3.5" SATA hard drives, as well as 2.5" hard drives and SSDs using an adapter. Of the three 3.5" bays, two support SATA II 3 Gb/s and one supports SATA III 6 Gb/s. There are also two M.2 NVMe PCIe M.2 2280 slots for SSD caching and auto-tiering to help continually optimize storage efficiency across M.2 SSDs, 2.5" SATA SSDs, and high capacity HDDs. Non-encrypted read speeds can reach up to 113 MB/s and write speeds max out around 112 MB/s, while using encryption still delivers read speeds of up to 103 MB/s and write speeds of up to 89 MB/s. Using its one 5 Gb/s USB 3.0 Type-A port and two USB 2.0 Type-A ports, this QNAP NAS can be connected to other QNAP devices, as well as other external drives and peripherals. Additionally, the TS-351 is validated with FIPS 140-2 AES 256-bit encryption, helping to prevent sensitive business data from unauthorized access and breaches.

QNAP's TS-351 runs using a 65W power supply that operates using 100-240V. It is compatible with Windows, Mac, Linux, and UNIX. Included is an Ethernet cable, a power cord, an AC adapter, and two M.2 SSD heatsinks. Protection is provided by a limited 2-year warranty.

General Features

Dual-Core High Performance

The TS-351 is designed for home and small offices, allowing you to effortlessly manage files and enjoy multimedia entertainment while also providing reliable data protection. It uses a 2.41 GHz Intel Celeron J1800 Dual-Core processor (burst up to 2.58 GHz) and 4GB of DDR3L memory (upgradable to 8GB), provides 3.5" SATA II 3Gb/s and SATA III 6 Gb/s drive bays, and supports AES 256-bit encryption for both full NAS volumes and shared folders, ensuring system performance while protecting the confidentiality of sensitive business data stored in the NAS.

Elegant Appearance, Effective Airflow

The TS-351 sports a stylish and elegant look with an industrial design concept to provide effective airflow and better cooling, ensuring smooth performance even under the heavy loads. The tooless 3.5" hard drive installation allows easier system setup and maintenance, while the front-panel LEDs assist in viewing system status.

M.2 SSDs for Cache Acceleration or Efficient Tiered Storage

The TS-351 supports SSD caching, and features two M.2 slots that support M.2 PCIe (Gen2 x1, up to 500 MB/s) NVMe SSDs with 2280 form factors (sold separately) for boosting the overall workflow of intensive, IOPS-demanding applications. Moreover, Qtier technology empowers the TS-351 with auto tiering that helps continuously optimize storage efficiency across M.2 SSDs, a 2.5" SATA SSD, and high-capacity HDDs with around-the-clock acceleration. Qtier 2.0 features IO-awareness that empowers SSD-tiered storage with a cache-like reserved space to handle burst I/O in real time, greatly maximizing the advantages of SSD.

Optimized SSD Performance with Over-Provisioning

With SSD prices continuing to become more affordable for home and small business users, there's never been a better time for using SSDs in your NAS to enjoy higher performance, faster file backups, smoother multimedia experiences, and optimized virtualization applications. The QTS 4.3.5 OS takes SSD functionality even further by supporting software-defined SSD RAID extra over-provisioning (OP) that enables you to allocate additional OP space from 1% to 60%, beneficial for optimal SSD random write speeds and extended lifespan with higher endurance. Now you can use affordable consumer SSDs for the TS-351, adjust the SSD OP, and potentially attain performance and endurance levels similar to enterprise-grade SSDs.

HBS 3 / QuDedup Technology

QuDedup technology deduplicates data at the source, helping to reduce the time and storage space needed for backup.


Enabling local caching on NAS for low-latency access to the connected cloud services.


Integrated AI algorithm for auto photo organization and a power search tool for more intuitive and streamlined photo management.

Snapshots Protect Your Data Against Ransomware

Snapshots help protect your data by fully recording the NAS system state and metadata. Use Storage & Snapshots Manager or File Station to easily manage snapshots and quickly restore the system to a normal state if an error occurs. QNAP snapshots are block-based and only record the changed data. Not only does this save storage space but also reduces the time required to back up and restore data. The TS-351 can support up to 256 snapshots per NAS and 256 snapshots per volume/LUN.

Have Fun with Your NAS!

The TS-351 transforms how you can enjoy your photos, music, and videos throughout your home and beyond. It also supports 360° panoramic photos and videos.

Photo Station
Take photos and manage them with Photo Station. Organize photos by folders or albums, and view them in several modes.

Music Station
With powerful, smart playlists, comprehensive search functions, and a user-friendly interface, Music Station is more than just music to your ears.

Video Station
Video Station's smart collection, advanced search, and easy sharing functions make it easy to enjoy your videos. Spoiler alert - you can even import video information form multiple online databases!

Enjoy a Streamlined Multimedia Experience

Whether accessing your media files on a computer or mobile device, you can enjoy a smooth playback experience. You can also connect the TS-351 directly to your TV or monitor via HDMI.

Full HD Video Output via HDMI
You can watch Full HD 1080p media files on an HDTV using the HDMI output. The TS-351 features various media players provided by HybridDesk Station (HD Station) for playing media files stored within it.

Real-Time Video Transcoding
The TS-351 supports H.264 hardware decoding and real-time transcoding, allowing you to convert 1080p videos to universal file formats that can be smoothly played on multiple devices. Please note that playback quality may vary due to factor that include playback software, file formats, system usage, and available bandwidth.

Complete Home Entertainment with Flexible Multimedia Streaming

Make the TS-351 your home multimedia hub to stream photos, music, and videos to computers, TVs, mobile devices, Apple TV, Google Chromecast, or DLNA-compatible devices.

Plex Media Server
Install the Plex Media Server app to stream media files from your NAS to your mobile devices, DLNA-compatible devices, and HDTV by using common media streaming devices, including Roku, Apple TV, Google Chromecast, and Amazon Fire TV.

Qmedia allows music, photos, and videos to be streamed to Android TVs or set-top boxed.

Video HD
Video HD is a free KODI add-on that combines KODI's streaming and video decoding capabilities and fully supports Video Station's features.

Tips for a More Productive Workday

The TS-351 provides a smart NAS solution for professionally managing files by integrating rich apps for storing, synchronizing, searching, and archiving files. You can easily access files on various devices (including USB storage and mobile phones), instantly synchronize files with friends' and/or colleagues' devices, quickly find specific files, and automatically organize your documents and media files. The TS-351 helps save your time for a more productive and efficient life.

Multi-Point Backup

QNAP's Hybrid Backup Sync app centralizes backup, restoration, and synchronization tasks for you to easily transfer the data stored in your TS-351 to remote servers, USB storage (via One-touch copy function), cloud storage, or another QNAP NAS. With Qsync, you can also access your NAS files from PCs, laptops, or mobile devices connected with the TS-351. Backing up Windows or Mac data to the TS-351 is also effortless by using QNAP's NetBak Replicator utility or Apple's Time Machine.

Surveillance Solution

QNAP's QVR Pro surveillance solution allows you to arrange a dedicated, independent storage space for surveillance data on the TS-351 and leverage the advantages of storage manageability from QTS. With QVR Pro, camera management, storage space allocation, camera live view and playback is greatly simplified. You can also use the QVR Pro Client mobile app to monitor your cameras, or use USB webcams as ONVIF network cameras with the QUSBCam2 app.

Flexible and Economical Storage Expansion

You need an easy solution to increase storage capacity when running out of space. QNAP provides several ways to expand your NAS storage as needed to accommodate data and business growth.

Use VJBOD (Virtual JBOD) to expand your storage capacity by using the unused storage of other QNAP NAS devices. Up to 8 QNAP NAS devices can be mounted as local disks on the TS-351.

Upgrade RAID Capacity
Hot swap lower-capacity drives with larger-capacity drives so that your QNAP NAS can grow with your business.

Migrate to a New NAS
Install your NAS hard drives into a larger QNAP NAS and retain all your existing data and configurations.

Productivity-Boosting Applications

Centrally manage and switch between different email accounts, back up emails to the NAS, and safeguard email security and personal privacy.

A popular web automation service for combining QNAP NAS and mobile devices/apps to customize NAS applets.

DJ2 Live
Live broadcasting through your QNAP NAS, while also streaming to public clouds. The footage is saved directly to the NAS for later playback.

Browser Station
Enable remote access through NAS-hosted web browsers to access local LAN resources without needing complex VPN settings.

Mattermost turns your QNAP NAS into a team communication platform that allows for instant messaging and can centrally store your conversations and files.

Mobile Apps
Simplify file access, NAS management, multimedia entertainment, surveillance, and download tasks on mobile devices with QNAP mobile apps.

Extend Hardware Warranty up to Five Years

The TS-351 is backed by a limited 2-year warranty at no extra cost. If needed, you can purchase a warranty extension that increases your coverage up to 5 years.

QNAP TS-351 Specs

Number of Bays3 x 3.5"
2 x M.2 (2280)
Media Card SlotsNone
Connections1 x USB Type-A (USB 3.1 / USB 3.2 Gen 1 (5 Gb/s))
2 x USB Type-A (USB 2.0 (480 Mb/s))
1 x HDMI Type-A (HDMI 1.4a)
1 x RJ45 (Gigabit Ethernet)
1 x 3.5 mm (Audio Out)
Compatible Drive InterfaceSATA II, SATA III, NVMe
Form FactorDesktop
RAID ModesRAID 0, 1, 5, JBOD, Single
Hot-Swap SupportYes
Wake on LANYes
Processor1 x Intel Celeron J1800 Dual-Core
Clock SpeedBase: 2.41 GHz / Maximum Boost: 2.58 GHz
GPUIntel HD Graphics
Total Installed Memory4 GB DDR3L
User-Replaceable Memory1 x 4 GB
Total Memory Slots2 x SO-DIMM
Maximum Memory Capacity8 GB
Supported ProtocolsAFP
iSCSI Target256
Max Cameras Supported8
Max Sync Tasks32
Installed Operating SystemQTS 4.3.4
OS CompatibilitymacOS 10.7 or Later
Windows 10
Windows 8
Windows 7
Windows Server 2016
Windows Server 2012 R2
Windows Server 2012
Windows Server 2008 R2
Windows Server 2003
File System Formats SupportedInternal: EXT4
External: EXT3, EXT4, FAT32, HFS+, NTFS
Supported BrowsersChrome, Firefox, Internet Explorer, Safari
Supported LanguagesBrazilian Portuguese
Simplified Chinese
Traditional Chinese
Max Number of Printers Supported3
Power Consumption26.22 W (Typical)
18.56 W (Standby)
Power SourceAC Adapter
PSU Wattage1 x 65 W
AC Input Power100 to 240 VAC, 50 / 60 Hz
Encryption256-Bit AES, FIPS 140-2 Level 2
Security FeaturesKensington Security Slot
VPN Server Connections100
Operating Temperature32 to 104°F / 0 to 40°C
Operating Humidity5 to 95%
Cooling1 x 90 mm Fan
Noise Level21.8 dBA
Built-In SpeakersYes, 1
Status MonitoringLED Indicator
Dimensions5.91 x 5.59 x 10.24" / 15.01 x 14.2 x 26.01 cm
Weight3.62 lb / 1.64 kg
Packaging Info
Package Weight6.29 lb
Box Dimensions (LxWxH)12.8 x 10.8 x 8.6"
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