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QNAP HS-251+ Diskless, Intel Celeron 2.0GHz quad-core processor (burst up to 2.42GHz), silent& fanless NAS, with HDMI-out for all your media needs.

Specifications:

CPU Intel® Celeron® 2.0GHz quad-core processor (burst up to 2.42GHz)
DRAM 2GB DDR3L RAM
Flash Memory 512MB DOM
Hard Disk Drive 2 x 3.5" or 2.5" SSD or NAS SATA 3Gb/s Hard Drives

NOTE:
1. The system is shipped without HDD.
2. For the HDD compatibility list, please visit https://www.qnap.com/compatibility
Hard Disk Tray 2 x Hot-swappable tray
LAN Port 2 x Gigabit RJ-45 Ethernet port
LED Indicators Status, LAN
USB 2 x USB 3.0 port
2 x USB 2.0 port
Support USB printer, pen drive, and USB UPS etc.
HDMI 1
Buttons Power/Status, reset
Alarm Buzzer System warning
IR Receiver V (QNAP RM-IR002 Remote Control)
Form Factor Compact
Dimensions 41.3 (H) x 302 (W) x 220 (D) mm
1.62 (H) x 11.89 (W) x 8.66 (D) inch
Weight Net: 1.56 kg / 3.44 lb
Gross: 2.62 kg / 5.78 lb
Power Consumption (W) S3 sleep mode: 0.6W
HDD standby: 7.1W
In operation:15.8W
(with 2 x 3TB WD WD30EFRX NAS HDD installed)
Sound Level* Sound pressure (LpAm): 6.5 dB(A)
Temperature 0-40˚C
Humidity 5~95% RH non-condensing, wet bulb: 27˚C
Power Supply External Power Adapter, 60W, 100-240V
Secure Design Kensington security slot for theft prevention

 

* Testing 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.

 

Features:

Operating System
QTS 4.2 (embedded Linux)
Power Management
  1. Wake on LAN
  2. Internal hard drive standby mode
  3. Scheduled power on/off
  4. Automatic power on after power recovery
  5. USB and network UPS support with SNMP management
  6. System sleep mode (S3)
Supported Client OS
  1. Windows 7 (32/64-bit), Windows 8 (32/64-bit), Windows Server 2003/2008 R2/2012/2012R2
  2. Apple Mac OS X
  3. Linux & UNIX
Access Right Management
  1. Batch user creation
  2. Import/Export users
  3. User quota management
  4. Local user access control for CIFS, AFP, FTP, and WebDAV
  5. Application access control for Photo Station, Music Station, Video Station, and File Station
  6. Subfolder permissions support for CIFS/SMB, AFP, FTP, and File Station
Supported Browsers
  1. Microsoft Internet Explorer 10+
  2. Mozilla Firefox 8+
  3. Apple Safari 4+
  4. Google Chrome
Domain Authentication Integration
  1. Microsoft Active Directory (AD) & Domain Controller support
  2. LDAP server, LDAP client
  3. Domain users login via CIFS/SMB, AFP, FTP, and File Station
Multilingual Support
  1. Chinese (Traditional & Simplified), Czech, Danish, Dutch, English, Finnish, French, German, Greek, Hungarian, Italian, Japanese, Korean, Norwegian, Polish, Portuguese (Brazil), Romanian, Russian, Spanish, Swedish, Thai, Turkish
myQNAPcloud Service
  1. Private cloud storage and sharing
  2. Free host name registration (DDNS)
  3. Supports myQNAPcloud SSL certificates (DDNS)
  4. Auto router configuration (via UPnP)
  5. Web-based file manager with HTTPS 2048-bit encryption
  6. CloudLink for remote access without any complicated router setup
  7. myQNAPcloud connect for easy VPN connection (Windows VPN utility)
File System
  1. Internal Hard Drive: EXT4
  2. External Hard Drive: EXT3, EXT4, NTFS, FAT32, HFS+
Qsync
  1. Syncs files across multiple devices with SSL support
  2. Selective synchronization for only syncing specific folders
  3. Use team folders as a file center for greater team collaboration (maximum sync tasks:32)
  4. Shares files by links via e-mail
  5. Policy settings for conflicting files and file type filter support
  6. Version control: up to 64 versions.
  7. Incremental synchronization for HDD space saving
  8. Unified privilege management
  9. Unified configuration management
  10. Supports central configuration mode
  11. Supports remote erase / restore
  12. Supports shared folders sync
  13. Supports Windows & Mac OS
Networking
  1. TCP/IP (IPv4 & IPv6: Dual Stack)*
  2. Dual Gigabit NICs with jumbo frame (failover, multi-IP settings, port trunking/NIC teaming)
  3. Service binding based on network interfaces
  4. Squid Proxy server
  5. Proxy client
  6. DHCP client, DHCP server
  7. Protocols: CIFS/SMB, AFP (v3.3), NFS(v3), FTP, FTPS, SFTP, TFTP, HTTP(S), Telnet, SSH, iSCSI, SNMP, SMTP, and SMSC
  8. UPnP & Bonjour Discovery
  9. USB Wi-Fi Adapter Support
* Not all services supports IPv6.
Web Administration
  1. Movable Icons and personalized desktop
  2. Smart toolbar and dashboard for neat system status display
  3. Smart fan Control
  4. Dynamic DNS (DDNS)
  5. SNMP
  6. Resource monitor
  7. Network recycle bin for file deletion via CIFS/SMB, AFP, and File Station
    - Automatic Cleanup
    - File Type Filter
  8. Comprehensive logs (events & connection)
  9. Syslog client/server
  10. System settings backup and restore
  11. Restore to factory default
  12. Mobile app: Qmanager for remote system monitoring & management
Security
  1. Network access protection with auto-blocking: SSH, Telnet, HTTP(S), FTP, CIFS/SMB, AFP
  2. CIFS host access control for shared folders
  3. FIPS 140-2 validated AES 256-bit volume-based and shared folder data encryption*
  4. AES 256-bit external drive encryption*
  5. Importable SSL certificates
  6. Instant alert via E-mail, SMS, beep,and push service
  7. 2-step verification
* Data encryption functions may be unavailable in accordance with the legislative restrictions of some countries.
Storage Management
  1. QNAP flexible Volume/LUN with thin provisioning and space reclaim
  2. RAID 0, RAID 1
  3. Supports storage pools
  4. Online volume expansion
  5. Online storage pool expansion
  6. Online RAID capacity expansion and online RAID level migration
  7. SMART data migration
  8. Storage expansion via QNAP UX-500P/UX-800P expansion units
  9. JBOD enclosure roaming
  10. SSD read-only/read-write cache
  11. Bad block scan and hard drive S.M.A.R.T.
  12. Bad block recovery
  13. RAID recovery
  14. Bitmap support
Powerful All-in-one server
File Server
  1. File sharing across Windows, Mac, and Linux/UNIX
  2. Windows ACL
  3. Advanced folder permissions for CIFS/SMB, AFP, FTP
  4. Shared folder aggregation (CIFS/SMB)
Download Station
  1. PC-less BT, FTP/FTPS, and HTTP/HTTPS, Thunder, FlashGet and qqdl download (up to 500 Tasks)
  2. BT download with Magnet Link and PT support
  3. Scheduled download and bandwidth control
  4. RSS subscription and download (broadcatching)
  5. BT search
  6. Proxy support for BT download
  7. Mobile app: Qget for downloads browsing and management
FTP Server
  1. FTP over SSL/TLS (Explicit)
  2. FXP support
  3. Passive ftp port range control
Notes Station
  1. A handy note-taking tool for everywhere you go via your private cloud.
  2. Direct and quick backup from Evernote with re-editing availability
  3. Supports Google Calendar
  4. Import/Export PDF and .epubfile
  5. RSS live feed and auto update
  6. Online quick preview of multimedia attachments
  7. Notes encrypt/decrypt
  8. Smart snapshot for version control
  9. Background tasks available for multi-tasking users
  10. Collaborate on notes with multiple users
  11. Supports graphical editor for note editing
  12. Three-tier Note structure for easy organizing
  13. full site backup for admin user
  14. Supports keyword searching
  15. Provides Chrome Extension: Notes Station Clipper (Clip web page content to your notes)
File Station
  1. Supports mounting a Cloud Drive (such as Google Drive, Dropbox, Microsoft OneDrive, Amazon Drive, Yandex Disk and Box).
  2. Supports mounting remote shared folders through FTP, WebDAV or Microsoft networking (SMB/CIFS)
  3. Supports opening documents via Office Online, Google Docs or Chrome Extension (Edit Office files in Google Docs, Sheets, and Slides)
  4. Supports ISO Mounting (Up to 256 ISO Files)
  5. Supports thumbnail display of multimedia files
  6. Supports sharing download links and upload links
  7. Supports sharing to other NAS users
  8. Drag-n-drop Files via Chrome and Firefox Browsers
  9. Photo, music, and video preview and playback with hardware-accelerated transcoding
  10. File Compression (ZIP or 7z)
  11. Creation of and sending download links for sharing public files with expiration date and password protection
  12. Supports displaying subtitles (*.SRT, UTF-8 format)
    - Video seeking support for video playback during on-the-fly transcoding
    - Supports slideshow playback in media viewer
  13. Mobile App: Qfile for file browsing and management
HD (HybridDesk) Station 3.0
  1. Watch various online content such as Flickr, Picasa, Shoutcast, etc.
  2. Web browsers (Chrome, Firefox)
  3. Supports multi-nation keyboard, input and mouse
  4. 4 new desktop themes
  5. Supports user login permissions
  6. A variety of applications are available including Skype, Plex, and more
Note:
- The playback and quality of some video files may be affected by the system's CPU and GPU decoding abilities.
Container Station
  1. Supports LXC and Docker
  2. Supports CPU/Memory management
  3. Download applications from the built-in Docker Hub Registry
  4. Supports one-click installation, container export/import & console mode
  5. Supports mounting NAS shared folders and data-only containers
  6. Supports auto port forwarding
  7. Supports auto-start containers
  8. Supports downloading Docker certificates
Virtualization Station
  1. Supports Virtual Machine (VM) creation to run operating systems such as Windows, Linux, Unix and Android (512MB RAM usable)
  2. Supports VM import and export
  3. Supports VM cloning
  4. Supports VM snapshots
  5. Supports VM backup and restore
  6. VM console can be displayed via HDMI output - QVM
  7. HTML5-based shared remote console
  8. Support three different networking modes: Isolated, External-only and Bridged
Transcode Management
  1. Transcode video files to 240p, 360p, 480p, 720p and 1080p resolution
  2. Automatic video transcoding for watched folders
  3. Hardware accelerated transcoding support
  4. Embed subtitles into videos for background transcoding
Signage Station
  1. Supports dynamic content including videos, images, music, and text
  2. Supports multi-user collaboration
  3. Supports searching using keywords
  4. Supports sharing by email and social network
  5. Supports design software: iArtist Lite
  6. Supports account authority management
  7. Supports playback on various browsers (Chrome, Firefox, IE, Safari)
  8. Supports most viewed, latest released and different categories content list
Backup Station
  1. Remote replication server (over rsync)
  2. Real-time remote replication (RTRR) to another QNAP NAS or FTP server
  3. Works as both RTRR server & client with bandwidth control
  4. Real-time & scheduled backup
  5. Backup versioning for RTRR
  6. Snapshot support for RTRR/Rsync
  7. Encryption, compression, file filter, and transfer rate limitation
  8. Encrypted replication between QNAP NAS servers
  9. Desktop backup with QNAP NetBak Replicator for Windows
  10. Apple Time Machine backup support
  11. Data backup to multiple external storage devices
  12. Synchronizes with cloud storage: Amazon S3, ElephantDrive, Dropbox, and Google Drive
  13. Third party backup software support: Veeam backup & replication, Acronis True Image, Arcserve backup, emc retrospect, Symantec Backup Exec, etc.
Storage Plug & Connect
  1. Creating and mapping shared folders by QNAP Windows Qfinder Pro
  2. Creation of and connection to iSCSI target/LUN
Print Server
  1. Max number of printers: 3
  2. Supports Internet Printing Protocol
  3. Print job display and management
  4. IP-based and domain name-based privilege control
iSCSI (IP SAN)
  1. iSCSI target with multi-LUNs per target (Up to 256 targets/LUNs combined)
  2. Supports LUN mapping & masking
  3. Online LUN capacity expansion
  4. Support for SPC-3 persistent reservation
  5. Supports MPIO & MC/S
  6. iSCSI LUN backup, one-time snapshot, and restoration
  7. iSCSI connection and management by QNAP Windows Qfinder Pro
  8. Virtual disk drive (via iSCSI initiator)
  9. Stack chaining master
  10. Max No. of virtual disk drives: 8
Photo Station
  1. Two browsing modes with gallery and management
  2. Show photos by thumbnails, list, timeline, or folder view
  3. Supports virtual/smart albums
  4. Validity control for sharing albums
  5. Tag photos with text, colors, and ratings
  6. Slideshows with background music and different transition effects
  7. Animated thumbnails for videos
  8. Geotag photos and display them on Google maps
  9. Advanced search by tags, metadata, etc
  10. Supports uploading photos/videos to Picasa, Flickr, Weibo, YouTube
  11. Supports face detection (with the Photo Station Extension)
  12. Supports PDF to image conversion (with the Photo Station Extension)
  13. Share slideshows links to social websites or by email
  14. Supports Facebook friends login
  15. Supports modification on photo taken date
  16. Backup/Restore album configuration
Surveillance Station
  1. Supports over 3,000 IP cameras
  2. Includes 2 free camera licenses, up to 40 camera channels via additional license purchase
  3. Instant playback to check recent events
  4. Online editing to edit cameras during live view
  5. Visual aid by e-map
  6. Playback and speed control using the shuttle bar
  7. Video preview on playback timeline
  8. Intelligent video analytics (IVA) for advanced video searching
  9. Surveillance client for Mac
  10. Mobile surveillance app: Vmobile (iOS and Android)
  11. Mobile recording app: Vcam (iOS and Android)
Music Station
  1. Play or share music via web browser
  2. Automatic classification via Media Library
  3. Supported audio formats: AIFF, APE, FLAC, M4A, M4A Apple Lossless (ALAC), MP3, OggVorbis, WAV (PCM, LPCM),WMA, WMA PRO, WMA VBR*
  4. Supports streaming music to multiple devices
  5. Supports changing album covers via Google search or uploading photos
  6. Internet radio (MP3)
  7. Up to 8 music alarms
  8. Mobile app: Qmusic for music streaming and management
* DRM-protected content is not supported.
VPN Server
  1. Secure remote access: PPTP、L2TP/IPsec&OpenVPN VPN services
  2. Max number of clients: 30
iTunes Server
  1. Audio and video sharing for Windows & Mac iTunes
VPN Client
  1. Supported VPN protocols: PPTP &OpenVPN services
  2. PPTP Authentication: PAP, CHAP, MS-CHAP, MS-CHAPv2
  3. PPTP Encryption: None, AES 40/128 bit, AES 256 bit
  4. OpenVPN Encryption: None, AES 40/128 bit, AES 256 bit
  5. Transmission package monitor
  6. OpenVPN port control
  7. OpenVPN link compression
Video Station
  1. Show photos by thumbnails, list, timeline, or folder view
  2. Supports virtual/smart collections
  3. Validity control for sharing collections
  4. Tag videos with text, color, and ratings
  5. Animated thumbnails for videos
  6. Share video links to social websites or through email
  7. Sort videos automatically into defined classifications
  8. Display movie information from IMDB
  9. Display movie posters from IMDB or user upload
  10. Supports displaying subtitles (*.SRT,*.ASS, *.SSA)
  11. Supports searching for subtitles online
  12. Supports importing subtitles
  13. Supports adjusting subtitles display style
  14. Supports Facebook friends login
  15. Supports custom video classification
  16. Supports multi-zone video display
  17. Video seeking support for video playback during on-the-fly transcoding
  18. Mobile app: Qvideo for online video browsing and management
DLNA Server
  1. Supports DLNA/UPnP TVs and players such as PlayStation 4 and Xbox One
  2. Supported audio formats: AIFF, APE, DSD (DSF, DFF), FLAC, M4A, M4A Apple Lossless (ALAC), MP3, OggVorbis, WAV (PCM, LPCM), WMA, WMA PRO, WMA VBR*
  3. Support CUE indexing file for APE, FLAC audio format.
  4. Video and Audio On-the-fly Transcoding
*DRM-protected content is not supported.
Cloud Backup Station
  1. Amazon S3
  2. Amazon Glacier
  3. WebDAV-based cloud storage
  4. Microsoft Azure
  5. OpenStack
Q'center (NAS CMS)
  1. Multiple NAS monitoring
  2. Utilization history reports
  3. Unified configuration management
  4. Visual display reports
  5. Monitor NAS behind NAT router with Q'center Assistant
  6. Virtual appliances supported for Hyper-V and VMware
AirPlay& Chromecast
  1. Streams videos, photos and music from NAS to Apple TV via File Station, Music Station, Photo Station, Video Station or mobile app (Qfile, Qmusic, Qphoto or Qvideo). Media Streaming add-on app will need to be install at the QTS's App Center.
  2. Streams videos, photos and music from NAS to TV with Chromecast via File Station, Music Station, Photo Station, Video Station or mobile app (Qfile, Qmusic, Qphoto or Qvideo). Media Streaming add-on app will need to be install at the QTS's App Center.
App Center
Over 100 official and community software add-ons

Designs and specifications are subject to change without notice.

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QNAP HS-251+ Diskless 2-Bay Silent & Fanless NAS

Your Custom Configuration:
  • No Hard Drive
  • No RAID
  • No RAM Upgrade
  • No RAIL
  • No Network Card
  • No Warranty
  • No SSD Cache