QNAP TS-251+-2G 8TB (2 x 4TB WD RED) 2 Bay NAS Unit with 2GB RAM

QuickFind: 746250 Mfr part code: TS-251+-2G/8TB-RED
  • 8TB (2 x 4TB WD RED) Drives Installed
  • Transcode Full HD videos on-the-fly or offline
  • Quickly find specific files by real-time, natural search with Qsirch
  • Play 1080p videos via HDMI

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Product Description

QNAP TS-251+-2G 8TB (2 x 4TB WD RED) 2 Bay NAS Unit with 2GB RAM

- CPU: Quad-Core Intel® Celeron® 2.0GHz (burst up to 2.42GHz)
- Floating Point Unit: V
- GPU: Intel® HD Graphics
- Hardware-Acclerated Transcoding: V
- Memory: System memory:   TS-251+-2G: 2GB DDR3L RAM (1 x 2GB)   TS-251+-8G: 8GB DDR3L RAM (2 x 4GB)   Total memory slots: 2 SODIMM   Expandable up to: 8 GB   NOTE:   1. When installing two memory modules, please ensure that they are the same size and ideally use the same type of RAM for both memory slots.   2. For the information of RAM module installation and compatible NAS models, please refer to the QNAP RAM Module Installation Guide
- Flash Memory: 512MB
- Drive: 2 x 2.5" or 3.5" SATA 6Gb/s, 3Gb/s HDD or SSD; hot swappable trays   NOTE:   For the HDD compatibility list, please visit https://www.qnap.com/compatibility
- Expansion Unit: Max. 1 (UX-800P, UX-500P)
- Gigabit LAN Ports: 2
- USB: 2 x USB 3.0 (Front: 1, Rear: 1)   2 x USB 2.0 (Rear)
- IR Receiver: Yes (QNAP RM-IR002 remote control)
- HDMI: 1
- LED Indicators: Power/Status, LAN, USB, HDD1-2
- Buttons: Power, Reset, USB Auto Copy
- Alarm Buzzer: System warning
- Form Factor: Tower
- Dimensions: (HxWxD) 168.5 x 102 x 225 mm   6.63 x 4.02 x 8.86 inch
- Weight: (Net / Gross) 1.28 kg (2.82 lbs) / 2.32 kg (5.11 lbs)
- System Fan: 1 x 7cm, 12V DC
- Kensington Security Slot: 1
- Power Supply: External Power Adapter, 60W, 100-240V
- Power Consumption (W): S3 sleep: 0.57   HDD standby: 10.56   In operation (typical): 18.09
- Temperature: 0 - 40 °C
- Humidity: 5~95% RH non-condensing, wet bulb: 27˚C    
- Package Contents: TS-251+   Ethernet cable x 2   Quick installation guide (QIG)   Flat head screw x 8 (for 3.5" HDD)   Flat head screw x 6 (for 2.5" HDD)   AC Adapter: SP-2BAY-ADAPTOR    Power cord x 1   IR Remote Control: RM-IR002

Technical Specification

QNAP TS-251+-2G 8TB (2 x 4TB WD RED) 2 Bay NAS Unit with 2GB RAM


Power Device External power adapter
Voltage Required AC 120/230 V
Power Provided 60 Watt

Processor / Memory

RAM Installed 2 GB (installed) / 8 GB (supported) - DDR3L
RAM (supported) 2 GB (installed) / 8 GB (supported) - DDR3L
Processors Installed 1 x Intel Celeron 2 GHz
Number of Cores Quad-Core
Max Supported Qty 1
Flash Memory Installed 512 MB


Device Type NAS server
Host Connectivity Gigabit Ethernet
Total Storage Capacity 8 TB
Installed Devices / Modules Qty 2 (installed) / 2 (max)
Width 10.2 cm
Depth 22.5 cm
Height 16.85 cm
Built-in Devices Led panel

Storage Controller

Interface Type SATA 6Gb/s

Hard Drive

Type HDD - hot-swap
Capacity 2 x 4 TB


Data Link Protocol 10Mb LAN, 100Mb LAN, GigE
Network / Transport Protocol TCP/IP, PPTP, L2TP, IPSec, iSCSI, SMTP, FTP, DHCP, Bonjour, SMB, DDNS
Remote Management Protocol SNMP 2, Telnet, SNMP 3, HTTP, HTTPS, TFTP, SSH
Network Services Compatibility Microsoft Active Directory (AD), Apple Bonjour Protocol, DHCP, DDNS, Microsoft CIFS, Network File System (NFS), FTP, FTPS, Server Message Block (SMB), Apple File Protocol (AFP), HTTP, HTTPS, Web-based Distributed Authoring and Versioning (WebDAV), SFTP
Features Trunking, LDAP support, wake on LAN (WOL), Syslog support, manageable, E-mail alert, print server, IPv6 support, proxy server, backup server, download client, file sharing, event log, Trivial File Transfer Protocol (TFTP) support, Access Control List (ACL) support, SSH support, iTunes server, Jumbo Frames support, DHCP server, FTP server, SMS alert, BitTorrent Client, bandwidth control, IPv4 support, surveillance station, teaming support, DLNA Media Server, Apple Time Machine compatible, DHCP client, e-mail notification, cloud backup, VPN Server, SFTP client, SNMP support, Apple AirPlay, Dropbox support, Real-time Remote Replication (RTRR)
Encryption Algorithm SSL, TLS, 256-bit AES
Compliant Standards DLNA CERTIFIED, UPnP

Security DVR

IP Cameras Supported 40

Expansion / Connectivity

Expansion Bays 2 (total) / 0 (free) x hot-swap - 2.5" / 3.5"
Expansion Slots 2 (total) / 1 (free) x SO-DIMM 204-pin
Interfaces 2 x Ethernet 1000Base-T - RJ-45 ¦ 2 x USB 3.0 - Type A ¦ 2 x USB 2.0 - Type A ¦ 1 x HDMI output


Cables Included 2 x network cable
Features Security lock slot (cable lock sold separately), audible alarm, remote control, built-in cooling fan
Security Slot Type Kensington security slot
Included Accessories Remote control

Software / System Requirements

Storage Operating System QNAP QTS 4.2
OS Required UNIX, Linux, Apple MacOS X, Microsoft Windows Server 2003, Microsoft Windows Server 2008 R2, Microsoft Windows 7 (32/64 bits), Microsoft Windows Server 2012, Windows 8 (32/64 bits), Microsoft Windows Server 2012 R2

Environmental Parameters

Min Operating Temperature 0 °C
Max Operating Temperature 40 °C
Humidity Range Operating 5 - 95% (non-condensing)

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QNAP TS-251+-2G 8TB (2 x 4TB WD RED) 2 Bay NAS Unit with 2GB RAM

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QNAP TS-251+-2G 8TB (2 x 4TB WD RED) 2 Bay NAS Unit with 2GB RAM

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