CPU | Intel® Celeron® J3355 dual-core 2.0 GHz processor (burst up to 2.5 GHz) Architecture: 64-bit x86 |
System memory | 2 GB DDR3L (1 x 2 GB) (Maximum 8 GB (2 x 4 GB) 2 x SODIMM DDR3L up to 1866, with dual-channel support) |
Flash Memory | 4GB eMMC |
Hard Disk Drive | 2 x 3.5" SATA 6 Gbps HDD Drive Compatibility • 3.5" SATA 6Gb/s HDD • 2.5" SATA 6Gb/s HDD • 2.5" SATA 6Gb/s SSD SSD Cache Acceleration Support 3.5" drive bay:1 to 2 |
USB Port | 2 x USB 3.0, 3 x USB 2.0 |
LAN Port | 1 x RJ45 |
PCIe Slot | 1 PCIe 2.0 x2 slot |
HDMI Output | 1 x HDMI v1.4b (up to 3840 x 2160 resolution at 30 Hz) |
Audio | 1 x speaker, 2 x MIC Input 1 x 3.5 mm line-out jack Alarm buzzer Note: You cannot use the speakers and the line-out jack simultaneously. |
RAID Support | RAID 0, 1, JBOD, Single |
IP Camera Support | Two free camera licenses Note: The application supports a maximum of 32 camera channels. You can purchase additional licenses on the QNAP website |
Power Supply | 65W AC adapter, 100-240V |
รายละเอียดสินค้า QNAP TS-251B-2G 2-bay NAS
The TS-251B combines secure data storage and multimedia entertainment into one device. Featuring a PCIe slot, the TS-251B is QNAP’s first home/SOHO NAS that allows you to flexibly extend its functionality and potential applications. You can install a QNAP QM2 card to provide M.2 SSD caching/10GbE connectivity and use with Qtier auto-tiering storage to enhance overall system performance; or install a wireless network card (such as the QNAP QWA-AC2600) to turn the TS-251B into a wireless access point and to wirelessly stream your multimedia throughout your home. The TS-251B supports dual-channel H.264 hardware decoding and transcoding, allowing you to enjoy watching NAS media files smoothly across various devices.
![]() The PCIe port supports installing a 10GbE network card, a QM2 dual-port M.2 SSD/10GbE card, a USB 3.1 Gen 2 (10Gbps) card, or a wireless network card. | ![]() 4K media playback and online transcoding; cross-device multimedia viewing via HDMI output or streaming applications. | ![]() Snapshots fully record the system status and data. If files are accidentally deleted or modified, you can quickly restore the previously-recorded data. |
![]() Hybrid Backup Sync consolidates backup and sync tasks into a single app, providing multiple layers of data protection. | ![]() Remotely access the apps and files on your TS-251B via myQNAPcloud and easily manage and share files. | ![]() Supports containerized applications and hosting virtual machines with various operating systems. |
With a PCIe expansion slot, the TS-251B provides flexibility in extending NAS functionality and potential applications. Install a QNAP QM2 card to provide M.2 SSD caching/10GbE connectivity and use with Qtier tiered storage for optimal system performance; use the TS-251B as a wireless access point by installing a compatible wireless network card (such as the QNAP QWA-AC2600) to create a wireless media streaming environment; or boost the USB connectivity of the TS-251B by installing a USB 3.1 Gen 2 (10Gbps) card.
» Learn More: QM2,WirelessAP Station
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By installing the QWA-AC2600 and WirelessAP Station app, your NAS will evolve into a high-performance wireless access point that can be connected to from multiple devices. The QWA-AC2600 can also be used to extend your wireless network coverage. Combined with useful features (including DHCP and NAT) provided by the Network and Virtual Switch app, the QWA-AC2600 can be used for a variety of applications, delivering private, fast, low-latency and secure connectivity across your home and/or workplace. (WirelessAP Station requires Container Station to be installed on your QNAP NAS.)
QNAP 10GbE/NBASE-T™ unmanaged switches allow you to instantly upgrade your network environment at a cost-effective price. With a 10GbE network you can enjoy blazing-fast transfer speeds, empower bandwidth-demanding tasks like virtualization, and enable simultaneous real-time access to large NAS-based files using multiple workstations (ideal for video editing and multimedia). QNAP also provides a 10GbE PCIe network expansion card for the TS-251B and Windows®/Linux® PCs to take advantage of high-speed LAN environments.
» Learn More: 10GbE switches,10GbE LAN cards
Real-time 4K video transcodingFeaturing advanced Intel® HD Graphics, the TS-251B supports dual-channel 4K H.264 hardware decoding and real-time transcoding, allowing you to convert videos to universal file formats that can be smoothly played across various devices*. You can also watch high-quality 4K@30FPS media files on a HDTV using the HDMI output or use with Plex® Media Server to stream media files to mobile devices and media streaming devices (including DLNA®, Roku®, Apple TV®, Amazon Fire TV® and Chromecast™). The QNAP RM-IR004 remote control (sold separately) can be configured using QButton to customize the actions of individual buttons, providing a more convenient NAS experience.*The TS-251B’s hardware provides H.264 hardware decoding, encoding and transcoding capabilities. However, playback quality may vary due to factors including playback software, file formats, system usage, and available bandwidth. » Learn More: Plex Media Server | ![]() |
QNAP provides a wide range of multimedia applications for you to easily enjoy photos, music, and videos.
![]() Cinema28 allows for single-interface management of all your media files and can stream files to every connected device throughout your home. | ![]() 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. |
Learn More: Multimedia Streaming
Snapshots help protect your data by fully recording the NAS system state and metadata. If files are accidentally deleted or modified or the system is afflicted by ransomware, you can use snapshots to quickly restore files to a previously-recorded state. 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-251B supports up to 1,024 snapshots per NAS and up to 256 snapshots per volume or LUN.
» Learn More: Volume & LUN Snapshots
QTS 4.3.5 provides various mechanisms to ensure the data saved on your TS-251B is carefully safeguarded, including the brand-new Notification Center that consolidates system logs and notifications into a single app and the Security Counselor that checks for weaknesses and offers helpful security recommendations.
![]() Notification CenterConsolidates system logs and notifications for all NAS apps into a single app with flexible rule settings, facilitating smooth and easy NAS management.» Learn More: Notification Center | ![]() Security CounselorChecks for weaknesses and offers recommendations to enhance NAS security. Anti-virus and anti-malware software is also integrated within Security Counselor to ensure the complete protection of your NAS and data.» Learn More: Security Counselor |
QNAP IFTTT Agent integrates the popular web automation service IFTTT (If This Then That), allowing you to create a near-unlimited number of automated workflows. Simply connect your IFTTT account with your TS-251B and set triggers and actions. For example, if you set a trigger as “Any new photo on the phone” and the action as "Upload the photo to QNAP NAS," then all the photos taken using your phone will be automatically uploaded to TS-251B.
» Learn More: IFTTT Agent
The app-driven QTS operating system provides solutions for simplifying file backup, management, search, and more. With File Station you can view and manage your files from NAS and multiple storage devices; the OCR Converter allows you to extract text from images; Qfiling helps automate file organization, and Qsirch helps quickly find files.
![]() Centralized File Management Use File Station to directly access files on USB devices - including optical disc drives. Files from different devices can be easily viewed and managed on a single interface. » Learn More: Centralized File Management | ![]() File Digitization OCR Converter extracts text from images, helping to boost productivity and making it easier to find files. » Learn More: OCR Converter |
![]() Smart Filing Qfiling automates file organization. Files are automatically archived into folders based on your settings. » Learn More: Qfiling | ![]() Full-text Search Qsirch quickly finds images, music, videos, documents, emails, and other files. » Learn More: Qsirch |
Multi-point file backup, access and syncThe TS-251B centrally stores data and files, and supports SMB/CIFS, AFP and NFS protocols for file sharing across Windows®, Mac®, and Linux®/UNIX® devices. Coupled with Qsync (a utility that turns a QNAP NAS into a safe, high-capacity data center for file synchronization) any file uploaded to the TS-251B will be made available for all linked devices, such as computers, laptops and mobile devices. Hybrid Backup Sync can help you easily backup or synchronize data on the TS-251B to other QNAP NAS, remote servers, or cloud storage for easy disaster recovery.» Learn More: Cross-platform file sharing,Hybrid Backup Sync,Qsync | ![]() |
QNAP’s QVR Pro surveillance solution allows you to arrange a dedicated, independent storage space for surveillance data on TS-251B and leverage the advantages of scalable storage. With QVR Pro, camera management, storage space allocation, camera live view, and playback is greatly simplified. You can also use USB webcams as network cameras with the QUSBCam2 app, and remotely monitor your surveillance feeds at any time with QVR Pro Client’s companion mobile app.
*The maximum number of channels supported varies by NAS model, network configuration, and camera settings. For more information, visit https://www.qnap.com/go/qvr-nas-selector.
» Learn More: QVR Pro,QNAP mobile apps
5,000+compatible IP cameras | 8free IP camera channels | 128max. IP camera channels | QUSBCam2record from USB webcams |
Virtualization Station and Container Station provide comprehensive solutions for creating virtualized environments to improve business IT infrastructure, workflows, and productivity.
![]() Virtualization Station Virtualization Station allows you to run multiple Windows®, Linux®, UNIX® and Android™ virtual machines on the TS-251B. You can use Virtual Network Computing (VNC) through a browser to operate the virtual machines. Virtualization Station is ideal for organizations to run multiple applications on a single NAS. » Learn More: Virtualization Station,P2V | ![]() Container Station Container Station integrates LXC and Docker® lightweight virtualization technologies. You can download apps from the built-in Docker Hub® to easily import/export container apps and manage access controls, enjoying the benefits of easy installation, transferability and high-efficiency. » Learn More: Container Station,QIoT Containers |
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.
![]() Upgrade RAID Capacity Hot swap lower-capacity drives with larger-capacity drives so that your QNAP NAS can grow with your business. » Learn More: Online RAID Capacity Upgrade | ![]() VJBOD Use VJBOD (Virtual JBOD) to expand your storage capacity by using the unused storage of other QNAP NAS. Up to 8 QNAP NAS can be mounted as local disks on the TS-251B. » Learn More: VJBOD | ![]() Attach Expansion Enclosures Connect two 4-bay TR-004 USB hardware RAID external enclosures and use the Storage & Snapshots Manager to easily handle NAS capacity expansion. |
Dual M.2 22110/2280 SATA SSD expansion card Dimension (L × W × H): 159.85 × 90.30 × 20.60 (mm) | |
Dual M.2 22110/2280 SATA SSD expansion card Dimension (L × W × H): 159.85 × 90.30 × 20.60 (mm) | |
Dual M.2 2280 SATA SSD & single-port 10GbE expansion card Dimension (L × W × H): 159.85 × 90.30 × 20.60 (mm) | |
Single-port (10Gbase-T) 10GbE network expansion card, PCIe Gen2 x4 Dimension (L × W × H): 25.00 × 16.00 × 5.00 (cm) Weight: 1.00 (kg) | |
Dual-port 10GbE SFP+ network expansion card Dimension (L × W × H): 260.00 × 150.00 × 58.00 (mm) Weight: 0.42 (g) | |
INFRARED (IR) remote control with 2 x AAA battery Dimension (L × W × H): 146.00 × 39.00 × 22.60 (mm) | |
USB-U31A2P01 Note: USB cabe is not included. | |
DDR type: DDRⅢL(204 PIN) Capacity: 2GB Spec: 256M X 16 Manufacturer: ADATA Frequency: DDR3-1866 Form(PIN): 204PIN Manufacturer P/N: ADDS186622G13-BSSE Power Supply: 1.35V Dram Organization: 256M*64 Temperature: 0℃~85℃ Environmental Regulation: RoHS Note: Make sure all DIMMs meet the requirements for your NAS model (the information listed in product specifications). | |
DDR type: DDRⅢL(204 PIN) Capacity: 4GB Spec: MICRON P-DIE 512M X 8 Manufacturer: ADATA Frequency: DDR3-1866 Form(PIN): 204PIN Manufacturer P/N: ADDS1866W4G13-BMIP Power Supply: 1.35V Dram Organization: 512M*64 Temperature: 0℃~85℃ Environmental Regulation: RoHS Note: Make sure all DIMMs meet the requirements for your NAS model (the information listed in product specifications). | |
1.5M SFP+ 10GbE DIRECT ATTACH CABLE Note: This 10GbE SFP+ network cable is designed for NAS models with an integrated 10GbE SFP+ LAN port or a 10GbE SFP+ network card. | |
3.0M SFP+ 10GbE DIRECT ATTACH CABLE Note: This 10GbE SFP+ network cable is designed for NAS models with an integrated 10GbE SFP+ LAN port or a 10GbE SFP+ network card. | |
Single-port (10Gbase-T) 10GbE network expansion card, PCIe Gen3 x4 Dimension (L × W × H): 18.00 × 11.00 × 5.50 (cm) Weight: 1.00 (kg) |
Specification TS-251B-2G
CPU | Intel® Celeron® J3355 dual-core 2.0 GHz processor (burst up to 2.5 GHz) Architecture: 64-bit x86 |
Graphics | Intel® HD Graphics 500 |
Encryption Acceleration | (AES-NI) |
System Memory | 2 GB DDR3L (1 x 2 GB) |
Maximum Memory | 8 GB (2 x 4 GB) |
Memory Slot | 2 x SODIMM DDR3L up to 1866, with dual-channel support |
Flash Memory | 4GB eMMC |
Drive Bay | 2 x 3.5" SATA 6 Gbps HDD |
Drive Compatibility | • 3.5" SATA 6Gb/s HDD • 2.5" SATA 6Gb/s HDD • 2.5" SATA 6Gb/s SSD |
SSD Cache Acceleration Support | 3.5" drive bay:1 to 2 |
Gigabit Ethernet Port | 1 x RJ45 |
USB Port | 2 x USB 3.0, 3 x USB 2.0 |
USB One Touch Copy | Front:USB 3.0 Type-A |
PCIe Slot | 1 PCIe 2.0 x2 slot |
HDMI Output | 1 x HDMI v1.4b (up to 3840 x 2160 resolution at 30 Hz) |
IR sensor | /, supporting QNAP RM-IR004 remote control (optional purchase) |
Audio | 1 x speaker, 2 x MIC Input 1 x 3.5 mm line-out jack Alarm buzzer Note: You cannot use the speakers and the line-out jack simultaneously. |
LED Indicators | Status/power、LAN、USB、HDD 1 - 2 |
Buttons | Power, Reset, USB One-touch-copy |
System Warning | Alarm buzzer and voice prompts |
Form Factor | Tower |
Dimensions (H x W x D) | 168 x 105 x 226 mm ( 6.61 x 4.13 x 8.90 inch) |
Net Weight | 1.53 kg (3.37 lbs) |
Power Consumption (W) | HDD standby:8.08 W In operation:15.25 W (with 2 x 1TB HDDs installed) |
Sound Level | Sound pressure (LpAm): 17.3 dB(A) |
Power Supply Unit | 65W AC adapter, 100-240V |
Fan | 1 x 7 cm |
Operating Temperature & Relative Humidity | 0 ~ 40˚C ( 32˚F ~ 104˚F ), 5 ~ 95% RH non-condensing, wet bulb: 27˚C (80.6˚F) |
Other Interfaces | Kensington security slot |
Operating System | QTS 4.3.4 (embedded Linux) |
Supported Client Operating Systems |
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Supported Browsers |
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Supported Languages | Chinese (traditional and simplified), Czech, Danish, Dutch, English, Finnish, French, German, Greek, Hungarian, Italian, Japanese, Korean, Norwegian, Polish, Portuguese (Brazil), Romanian, Russian, Spanish, Swedish, Thai, and Turkish |
Supported File Systems |
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Network & Virtual Switch |
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Security |
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Storage Management |
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iSCSI (IP SAN) |
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Power Management |
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Access Rights Management |
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Domain Authentication |
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myQNAPcloud |
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Qsync |
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Resource Monitor |
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Helpdesk |
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Web Administration |
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File Server |
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FTP Server |
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File Station |
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Qfiling |
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Transcode Management |
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Hybrid Backup Sync |
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Cloud Drive Sync |
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Photo Station |
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Music Station |
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iTunes Server | Audio and video sharing for Windows & Mac iTunes |
Video Station |
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Cinema28 |
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Virtualization Station |
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Container Station |
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Qsirch |
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QVR Pro |
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QVR Pro Client |
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QVR Center |
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QVR Guard |
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Surveillance Station |
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QVPN Service |
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DLNA Server |
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Q’center (NAS CMS) |
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OceanKTV |
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Qfinder Pro |
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App Center |
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AirPlay & Chromecast |
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Download Station |
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Notes Station 3 |
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HD (HybridDesk) Station 3.13 |
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Linux Station |
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Qcontactz |
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IFTTT Agent |
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General Notes |
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Web Server |
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![]() TS-251B | ![]() Ethernet Cable x 1 | ![]() AC Adapter |
![]() Power Cord | ![]() Flat head screw (for 3.5" HDD) x8 | ![]() Flat head screw (for 2.5" HDD) x6 |
![]() Quick Installation Guide (QIG) |