Cost-effective 3-bay RAID 5 NAS with two M.2 SSD slots (PCIe Gen2 x1), combining media center functionality with efficient auto-tiered storage.
30% of QNAP users choose RAID 5 arrays for their NAS to provide higher data protection, better system performance and optimized storage utilization. The 3-bay TS-351 not only allows you to build a RAID 5 array on your NAS with the fewest disks, but also features M.2 SSD slots and efficient auto-tiered storage that realizes optimal system performance. The TS-351 is also a home entertainment portal for streaming and sharing photos, music, and videos throughout your home and beyond. Featuring a minimalist design, the TS-351 can easily fit your home space as a brilliant digital hub!
Build a secure RAID 5 array with three disks for optimized storage capacity and protection against one disk failing.
H.264 hardware decoding and real-time transcoding; Full HD 1080p HDMI output for direct multimedia playback.
Install SSDs for cache acceleration with the built-in M.2 PCIe (Gen2 x1, 5Gb/s) NVMe SSD slots.
Effortlessly centralize, organize, browse, and share your multimedia files.
Qtier™ technology and SSD caching enable 24/7-optimized storage efficiency.
Snapshots fully record system status and data, allowing you to protect files and data from accidental deletion and malware attacks.
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 an Intel® Celeron® J1800 dual-core 2.41 GHz processor (burst up to 2.58 GHz) and 2GB/4GB DDR3L memory (upgradable to 8GB), provides 3.5-inch SATA 3Gb/s and 6Gb/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 heaviest loads. The tool-less 3.5-inch 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, 5Gb/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-inch SATA SSD, and high-capacity HDDs with around-the-clock acceleration. The new 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.
Enjoy optimized SSD performance with extra 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 latest QTS 4.3.5 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.
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 with 4GB RAM can support up to 256 snapshots per NAS and 256 snapshots per volume/LUN.
Have fun with your NAS!
The TS-351 transforms how to enjoy your photos, music and videos throughout your home and beyond. It also supports 360-degree panorama photos and videos!
Take photos anytime, anywhere and manage them with Photo Station. Organize photos by folders or albums, and view them in several modes.
With powerful smart playlists, comprehensive search functions and a user-friendly interface, Music Station is more than just music to your ears.
Video Station's smart collection, advanced search, and easy sharing functions make it so easy to enjoy your videos. Spoiler alert: you can even import video information from multiple online databases!
Enjoy a streamlined multimedia experience on any device
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!
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.
Install Plex® Media Server app to stream media files from 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®).
QVHelper allows users to stream media files or music playlists from a QNAP NAS to VLC player.
Qmedia allows music, photos and videos to be effortlessly streamed to Android TVs or set-top boxes.
Video HD is a free KODI™ add-on that combines KODI's streaming and video decoding capabilities and fully supports Video Station's features.
Intel® Celeron® J1800 dual core 2.41 GHz processor, up to 2.58 GHz
2 GB DDR3L (1 x 2 GB)
4 GB DDR3L (1 x 4 GB)
8 GB (2 x 4 GB)
2 x SODIMM slot
512 MB NAND Flash
Hot-swappable 3 x 3.5"/2.5" SATA HDDs/SSDs
1. HDD 1~2 supports SATA 3Gb/s, HDD 3 supports SATA 6Gb/s
2. 2.5-inch HDD/SSD drive tray bases can be purchased from QNAP Online Shop
M.2 SSD Slot
2 x M.2 PCIe (Gen2 x1, 5Gbps) NVMe 2280 slots
1. The M.2 SSD is not included as standard.
2. M.2 SSD operations can easily generate excessive heat. It is recommended to install a heatsink (from QNAP or a third-party provider) on the M.2 SSD.
1 x HDMI v1.4a
Gigabit Ethernet Port
1 x Gigabit RJ45
1 x USB 3.0
2 x USB 2.0
1 x Built-in speaker
1 x 3.5mm line out jack
Note: You cannot use the speakers and the line-out jack simultaneously.
Status/Power, LAN, USB, HDD 1-3, M.2 SSD 1-2
Power, Reset, USB One-touch-copy
Buzzer or Smart voice prompt
Dimensions (H x W x D)
142 x 150 x 260.1 mm
5.59 x 5.9 x 10.24 inch
Power Consumption (W)
HDD standby: 13.21 W
In operation: 25.63 W
(with 3 x HDDs and 2 x M.2 SSDs)
M.2 SSD: INTEL SSDPEKKW12 128G
Sound pressure (LpAm): 21.8 dB(A)
Net weight: 1.64 kg (3.62 lbs)
Gross Weight: 2.69 kg (5.93 lbs)
Operating Temperature & Relative Humidity
0 ~ 40˚C ( 32˚F ~ 104˚F ), 5 ~ 95% RH non-condensing, wet bulb: 27˚C (80.6˚F)
Kensington security slot
1 x 9cm smart fan (12V DC)
Power Supply Unit
65W AC Adapter, 100-240V
Note: Use only QNAP memory modules to maintain system performance and stability. For NAS devices with more than one memory slot, use QNAP modules with identical specifications. Warning: Using unsupported modules may degrade performance, cause errors, or prevent the operating system from starting.
* Sound Level Test Environment: Refer to ISO 7779; Maximum HDD loaded; Bystander Position; Average data from 1 meter in front of operating NAS.
Designs and specifications are subject to change without notice.
| Stock code || IBQ-351-4G|
| Brand || Qnap|
| Series || Desktop NAS|
| Model || TS-351-4G|
| Type || 3-Bay RAID (4GB RAM, Celeron) + 2x M.2 NVMe|
| ROHS || Y|
| Date added || 04/09/2018|
TS-351-4G Spec Information
| Form Factor / Drive Height || 142 x 150 x 260.1 mm|
| Platter size || 3.5"|
| Platter (alternate) || 2.5"|
| RAM/Cache || 4GB|
| Guarantee || 2yr|
| Processor || Intel Celeron J1800 dual-core 2.41 GHz|
| CPU Mark (cpubenchmark.net) || 1025|
| Total Drives || 3|
| Total Drives (alternate) || 3|
| RAID || 0:1:5:JBOD:|
| RAID Levels || Single Disk, JBOD, RAID 0, 1, 5, 10|
TS-351-4G Spec Connections
|SATA||SATA 7-pin Discrete with Power||Internal||3|
|USB3||USB3 type A (host)||External||1|
|USB2||USB2 type A (host)||External||2|
| Speed/RPM || 6Gb/s to Gigabit Ethernet (1,000 Mbit/s)|
| Colour || White|
| Weight (kg) || 2.69kg|
| Weight (bare) || 1.64kg|
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