QNAP 2-Bay Personal Cloud NAS/DAS with USB direct access (4GB RAM version)

  • Discontinued - Call for Alternative
  • Supports Virtual JBOD (VJBOD) to maximize the storage utilization of multiple QNAP NAS units
  • HDMI output and the free remote control
  • Build a personal karaoke system with OceanKTV
SKU: TS-251A-4G-US TS-251A-4G-US-2185
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QNAP 2-Bay Personal Cloud NAS/DAS with USB direct access (4GB RAM version)
  • Discontinued - Call for Alternative
  • Supports Virtual JBOD (VJBOD) to maximize the storage utilization of multiple QNAP NAS units
  • HDMI output and the free remote control
  • Build a personal karaoke system with OceanKTV

The TS-251A-2G-US provides the innovative USB QuickAccess port that allows you to quickly complete the first-time NAS installation and to then directly access files and data stored on the NAS. It also supports two additional transmission modes: Ethernet NAS mode and iSCSI SAN block-based mode. Combining USB QuickAccess, NAS and iSCSI-SAN into one box, the TS-251A-2G-US is a powerful but easy-to-use storage solution ideal for backup, synchronization, remote access, and entertainment. It greatly helps to boost productivity and can meet the demands of photographers and audiovisual enthusiasts for direct, quick access to files.

The TS-251A-2G-US is powered by an advanced 14nm Intel® Celeron® dual-core 1.6GHz processor that features low TDP (only 6 watts) and can automatically burst up to 2.48GHz. Coupled with dual-channel 4GB DDR3L-1600 dual-channel RAM (upgradable to 8GB), dual Gigabit LAN ports, and SATA 6Gb/s, the TS-251A-2G-US can deliver up to 211.88 MB/s throughput for optimizing mission-critical tasks while still being energy efficient. The TS-251A-2G-US also features Intel® AES-NI hardware-accelerated encryption to deliver up to 209.13 MB/s throughput with AES 256-bit throughput with AES-NI encryption for both full NAS volume and shared folders, boosting system performance & security while ensuring the safety of sensitive business data stored in the NAS.



SKU: TS-251A-4G-US

In The Box
2x Ethernet cable
65W AC Adapter
Power cord
8x Flat head screw (for 3.5" HDD)
6x Flat head screw (for 2.5"HDD)
IR Remote Control:RM-IR002
Quick Installation Guide

Special Feature: The TS-251A features an innovative USB QuickAccess port that allows you to complete the first-time installation and setup of your TS-251A without requiring network connectivity.

Dimensions: 6.65" x 4.02" x 8.62"

Transmission: 2x Gigabit RJ45 LAN port 3x USB 3.0 ports (Front: 1, Rear:2)

Power: 65W AC power adapter, 100-240V AC

Storage: 2x 3.5"/2.5" SATA 6Gb/s HDDs/SSDs

Service: No monthly fee


 Processor: 14nm Intel® Celeron® N3060 dual-core 1.6GHz (up to 2.48GHz)
 System Memory: 4GB DDR3L (2 x 2GB)
 Maximum Memory: 8GB
 Memory Slot: 2 x SODIMM DDR3L (For dual-DIMM configurations, you must use a pair of identical DDR3L modules.)
 Flash Memory: 4GB, pre-loaded with QTS system
 Drive Type: 2 x 3.5-inch/2.5-inch SATA 6Gb/s HDDs/SSDs
 GbE LAN: 2 x Gigabit RJ45 LAN port
 USB Port: 3 x USB 3.0 ports (Front: 1, Rear:2)
 USB QuickAccess: (USB 3.0 Micro-B); USB cable is not included
 HDMI: 1, max. resolution 3840 x 2160 @ 30Hz
 Audio Input: 3.5mm Microphone Input jack (for dynamic microphone)
 Audio Output: 3.5mm Line Out jack (for ampliers or speakers)
 LED Indicator: Status/Power, USB, HDD 1, HDD 2
 Button: Power/Status, USB one-touch-backup, reset
 IR Receiver: Supports QNAP RM-IR002 and MCE-compliant remote controls
 Others: Kensington security slot, system maintenance port
 Operating Temperature: 0-40°C
 Relative Humidity: 5-95% RH non-condensing, wet bulb: 27°C
 Noise Level: 18.3 dB (A)
 Fan: 1 x 7cm system fan (12V DC)


 Power: 65W AC power adapter, 100-240V AC
 Power Consumption:
 System sleep: 0.72W
 HDD standby: 7.9W
 In operation: 16.2W (with 2 x 2TB HDDs)


 Operating System: QTS 4.2 (embedded Linux)

Network & Virtual Switch

 DHCP client, DHCP server
 USB Wi-Fi Adapter Support
 Virtual Switch

Access Right Management

 Batch users creation, import/export users
 User quota management
 Local user access control for CIFS, AFP, FTP, and WebDAV
 Application access control for Photo Station, Music Station, Video Station, and File Station
 Subfolder permissions support for CIFS/SMB, AFP, FTP, and File Station

Supported Client OS

 Apple Mac OS 10.7 or later
 Linux and UNIX
 Microsoft Windows 7, 8, and 10
 Microsoft Windows Server 2003, 2008 R2, 2012, 2012 R2 and 2016

Supported Browsers

 Microsoft Internet Explorer 10+, Google Chrome, Apple Safari 7+, Mozilla Firefox

myQNAPcloud Service

 Private cloud storage and sharing
 Free hostname registration (DDNS)
 Optional myQNAPcloud SSL certificates (DDNS)
 Auto router configuration (via UPnP)
 Web-based file manager with HTTPS 2048-bit encryption
 CloudLink for remote access without any complicated router setup
 myQNAPcloud connect for easy VPN connection (Windows VPN utility)

File System

 Internal Hard Drive: EXT4
 External Hard Drive: EXT3, EXT4, NTFS, FAT32, HFS+


 Sync files across multiple devices with SSL secure connection
 Selective synchronization for only syncing specific folders
 Use team folders as a file center for greater team collaboration (maximum sync tasks:32)
 Shares files by links via e-mail
 Policy settings for conflicting files and file type filter support
 Version control: up to 64 versions
 Supports central configuration mode
 Supports remote erase/restore
 Supports Windows & Mac OS


 TCP/IP (IPv4 & IPv6: Dual Stack)1
 Dual Gigabit NICs (failover, multi-IP settings, port trunking/NIC teaming)
 Service binding based on network interfaces
 Squid Proxy server & Proxy client
 Protocols: CIFS/SMB, AFP (v3.3), NFS(v3), FTP, FTPS, SFTP, TFTP, HTTP(S), Telnet, SSH, iSCSI, SNMP, SMTP, and SMSC
 UPnP & Bonjour Discovery

Web Administration

 Multi-window, multi-tasking based system management
 Dynamic DNS (DDNS)
 SNMP (v2 & v3)
 Resource monitor


 Network access protection with Auto-blocking: SSH, Telnet, HTTP(S), FTP, CIFS/SMB, AFP
 CIFS host access control for shared folders
 FIPS 140-2 validated AES 256-bit volume-based and shared folder data encryption 2
 AES 256-bit external drive encryption2
 Importable SSL certificates
 Instant alerts via email, SMS, beep, and push service
 2-step verification

File Server

 File sharing across Windows, Mac, and Linux/ UNIX
 Windows ACL
 Advanced folder permissions for CIFS/SMB, AFP, FTP
 Shared folder aggregation (CIFS/SMB)

Power Management

 Wake on LAN
 Internal hard drive standby mode
 Scheduled power on/off
 Automatic power on after power recovery
 USB and network UPS support with SNMP management
 System sleep mode (S3)

FTP Server

 FTP over SSL/TLS (Explicit)
 FXP support

Cloud Drive Sync

 Multiple cloud account management like Google Drive, Dropbox, OneDrive, and hubiC
 Supports multiple cloud accounts
 A concurrent job execution and multi-threaded data transfer
 Per-account bandwidth throttling

Cloud Backup Station

 Amazon S3 Plus (including Amazon S3), Glacier
 Google Cloud Storage
 WebDAV-based cloud storage
 Microsoft Azure
 OpenStack Swift

VPN Server

 Secure remote access: PPTP?L2TP/IPsec & OpenVPN VPN services
 Max number of clients: 45 (15 clients for each protocol)

VPN Client

 Supported VPN protocols: PPTP and OpenVPN services
 PPTP Authentication: PAP, CHAP, MS-CHAP, MS-CHAPv2
 PPTP Encryption: None, AES 40/128 bit, AES 256 bit
 OpenVPN Encryption: None, AES 40/128 bit, AES 256 bit
 Transmission package monitor
 OpenVPN port control & link compression

iTunes Server

 Audio and video sharing for Windows & Mac iTunes

DLNA Server

 Supports DLNA/UPnP TVs and players such as PlayStation 4 and Xbox One
 Support CUE indexing file for APE, FLAC audio format.
 Video and Audio On-the-fly Transcoding


 Use the NAS as a karaoke machine.
 Display songs by artists, languages, and favorites.
 Enhance the experience with effects such as tuning echo, key, or applause
 Control the playlist with a mobile app.
 Supports keyboard and remote control (RM-RF001/ RM-IR002)

AirPlay & Chromecast

 Streams videos, photos and music from NAS to Apple TV or Chromecast via File Station, Music Station, Photo Station, Video Station or mobile app (Qfile, Qmusic, Qphoto or Qvideo).
 Note: The Media Streaming add-on app must be installed from the QTS App Center.

Web Server

 HTTP/HTTPS Connections
 Supports WebDAV Connection
 Supports Virtual Host (Max: 32)
 Importable SSL Certificate

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