The TS-251A provides the innovative USB (Universal Serial Bus) 3.0 Quick Access port that means that you can quickly complete the first-time NAS installation & to then directly access files & data stored on the NAS. It also supports two additional transmission modes: Ethernet NAS mode & i SCSI SAN block-based mode. Combining USB (Universal Serial Bus) Quick Access, NAS & i SCSI-SAN into one box, the TS-251A is a powerful but easy-to-use storage solution ideal for backup, synchronization, remote access, & entertainment. It greatly helps to boost productivity & can meet the demands of photographers & audiovisual enthusiasts for direct, quick access to files. The TS-251A is powered by an upgradable & high-performance 14nm Intel Celeron N3060 dual-core 1.6 G Hz processor, & supports 4K video playback & transcoding. Pre-installed with 4GB DDR3L (2 x 2GB) RAM Excellent system performance, ideal for centralized management, file sharing & backup USB (Universal Serial Bus) Quick Access port for accessing files without needing a network connection Supports 4K hardware decoding & transcodes 4K H.264 videos on-the-fly or offline Enjoy the best audio-visual experience with HDMI output, multi-channel surround sound & the free remote control Build a personal karaoke system with Ocean KTV Linux Station supports Ubuntu with direct output via HDMI A hybrid approach to virtualization: Virtualization Station & Container Station Supports Virtual JBOD (VJBOD) to maximize the storage utilization of multiple QNAP NAS units 14nm Intel Celeron N3060 dual-core CPU & hardware-accelerated encryption engine The TS-251A is powered by an advanced 14nm Intel Celeron dual-core 1.6 G Hz processor that features low TDP (only 6 watts) & can automatically burst up to 2.48 G Hz. Coupled with dual-channel 2/4GB DDR3L-1600 dual-channel RAM (upgradable to 8GB), dual Gigabit LAN ports, & SATA 6 Gb/s, the TS-251A can deliver up to 211.88 MB/s throughput for optimizing mission-critical tasks while still being energy efficient. The TS-251A 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 & shared folders, boosting system performance & security while ensuring the safety of sensitive business data stored in the NAS. Direct access to files with the USB (Universal Serial Bus) Quick Access port The TS-251A features an innovative USB (Universal Serial Bus) 3.0 Quick Access port that means that you can complete the first-time installation & setup of your TS-251A without requiring network connectivity. The files & data stored on the TS-251A can also be directly accessed by using Qfinder Pro* & a USB (Universal Serial Bus) 3.0 A-Male to Micro B-Male cable or a USB (Universal Serial Bus) 2.0 Micro B cable**. Furthermore, you can assign access rights to users for different folders to prevent unauthorized access to important files. * Qfinder Pro & USB (Universal Serial Bus) Quick Access support Windows 8.0 (and above) & Mac OS X 10.7 (and above). Other versions may require driver installation. **A USB (Universal Serial Bus) cable is not included. USB (Universal Serial Bus) Quick Access/NAS/i SCSI SAN triple solution The TS-251A innovatively re-defines what NAS can do by providing a USB (Universal Serial Bus) 3.0 Quick Access/NAS/i SCSI SAN triple solution. It discards the restriction of conventional DAS that only allows connecting to one device, & breaks the cost barrier for a high-speed Ethernet solution. The TS-251A’s three data transmission modes not only work independently, but they also can simultaneously run with no bandwidth interference, allowing you to multi-task with utmost productivity. USB (Universal Serial Bus) Quick Access Mode You can instantly access files & data stored on the TS-251A by connecting a PC/ Mac to its USB (Universal Serial Bus) 3.0 Quick Access port & by using the Qfinder Pro application. To balance security & convenience needs, this method provides three access authentication modes. These settings can be easily configured in Network & Virtual Switch in the QTS management interface: “ All NAS Users” (default): A NAS username & password are required to use Quick Access to access data stored on the NAS. “ Everyone”: Allows everyone to access data stored on the NAS using Quick Access with no username or password required. “ Selected Users & Groups”: Only authorized users/groups can use Quick Access to access data stored on the NAS (a username or password is also required). The TS-251A’s USB (Universal Serial Bus) mode is helpful for users that handle large volumes of media files on a daily basis. It provides an extremely convenient & fast solution for users to store & backup data on their computers or to access data on their NAS. With the USB (Universal Serial Bus) mode the TS-251A is plug & use without compromising convenience or safety. Ethernet NAS mode The TS-251A features Ethernet networking for flexible & simultaneous file sharing across multiple devices, using SMB/CIFS, NFS & AFP protocols for sharing across Windows, Mac & Linux/UNIX networks. Use Qfinder Pro to find the TS-251 As Ethernet IP address to connect to it. i SCSI SAN block-based mode The TS-251A supports i SCSI SAN. After creating an i SCSI target on the TS-251A, you can access the i SCSI with your computer* using the NAS IP. *i SCSI initiator for Mac: ATTO Xtend SAN or SNS global SAN; for Windows: Microsoft i SCSI initiator Superior 4K video transcoding Featuring advanced 8th-generation Intel HD Graphics, the TS-251A supports 4K H.264 hardware decoding & delivers superior real-time 4K & 1080p video transcoding to convert videos to universal formats that can be smoothly played on PCs, mobile devices & Smart TVs*. With offline transcoding, even when you can only connect using a low-speed Internet connection, you can still enjoy smooth video playback via File Station, Video Station, & the Qfile mobile app by selecting a pre-rendered lower resolution video. The TS-251A also means that you can set a dedicated folder for automatic video transcoding. * Supported video formats depend on the hardware & software specifications of the devices. Playback capability & quality may vary due to factors including the original file formats/quality, hardware & software limitations, & output devices. Specifications Ordering P/N TS-251A-4G TS-251A-2G Processor 14nm Intel Celeron N3060 dual-core 1.6 G Hz (up to 2.48 G Hz) Hardware Encryption Accleration &10003;&65292;AES-NI System Memory 4GB DDR3L (2 x 2GB) 2GB DDR3L (2 x 1GB) 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"/2.5" SATA 6 Gb/s HDDs/SSDs Gb E LAN 2 x Gigabit RJ45 LAN port USB (Universal Serial Bus) Port 3 x USB (Universal Serial Bus) 3.0 ports (Front: 1, Rear:2) SD Card Reader &10003; USB (Universal Serial Bus) Quick Access &10003; (USB 3.0 Micro-B); USB (Universal Serial Bus) cable is not included HDMI 1, max. resolution 3840 x 2160 @ 30 Hz 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 (Universal Serial Bus), HDD 1, HDD 2 Button Power/ Status, USB (Universal Serial Bus) one-touch-backup, reset IR Receiver &10003;, supports QNAP RM-IR002 & MCE-compliant remote controls Others Kensington security slot&65292;system maintenance port Dimension 168.5 x 102 x 225 mm 6.63 x 4.02 x 8.86 inch (Hx Wx D) Weight Net: 1.28kg (2.82 lbs) Gross: 2.64kg (5.82 lbs) Operating Temperature 0-40&730;C Relative Humidity 5~95% RH non-condensing, wet bulb: 27&730;C Noise Level 18.3 d B (A) Refer to ISO 7779 ; Maximum HDD loaded ; Bystander Position ; Average data from 1 meter in front of operating NAS Power Consumption System sleep: 0.72W HDD standby:7.9W In operation:16.2W (with 2 x 2TB HDDs) Power 65W AC power adapter, 100-240V AC Fan 1 x 7cm system fan (12V DC)