QNAP 2-Bay NAS Enclosure with 4GB RAM

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Identifiers
MPN QNAP TS-251D-4G
Dimensions / Weight
Key Features
AC input frequency
The frequency of the alternating current supplied to a power supply or charger, expressed in hertz (Hz). It indicates the acceptable operating range for the electrical mains that powers the device, ensuring proper functionality and safety.
50 - 60 Hz
AC input voltage
The range of alternating current voltage that the product accepts from its power source, expressed in volts (V). It indicates the minimum and maximum supply voltages compatible with the device across different regions.
100 - 240 V
Access Control List ACL
Indicates whether the product supports an Access Control List (ACL) feature, allowing administrators to define rules that permit or deny network traffic based on criteria such as IP address, port number, or protocol.
Yes
Backup features Cloud, USB drive
Browser supported
A list of web browsers that the product can run or support, typically including major desktop and mobile browsers such as Chrome, Firefox, Safari, Edge, Internet Explorer, Opera, and others. Each value represents a distinct browser name or version range that has been verified to work with the device.
Apple Safari 7+, Google Chrome, Microsoft Internet Explorer 10+, Mozilla Firefox
Cable lock slot type
Specifies the type of interface or mechanism used to secure a cable in its port, such as Kensington, Noble, IBM, or other standard lock slots. This attribute helps users identify compatibility and security features of the device.
Kensington
Cables included
A list of the cable types that are supplied with the product, such as USB, HDMI, VGA, DisplayPort, LAN (RJ‑45), SATA, audio or other relevant connectors.
AC, LAN (RJ-45)
Chassis type
The physical form factor of a computer chassis, indicating its size and layout such as Tower, Desktop, Mini‑PC, or rack units (e.g., 1U, 2U). This attribute helps users identify the footprint, mounting options, and compatibility with other hardware.
Tower
Colour
The colour or combination of colours that a product is available in, expressed as common names such as "Black", "Silver" or comma‑separated lists like "Black, White". It indicates the visual appearance of the item for consumers.
White
Cooling type
The method or mechanism used to dissipate heat from a component such as a processor, graphics card, or other electronic part. It indicates whether the device relies on active cooling (fans or liquid pumps), passive heat sinks, or hybrid solutions, and helps users assess thermal performance and noise levels.
Active
Device class
A free‑text label that identifies the general category or type of a device, such as "NAS", "Server", "Router", "Storage Enclosure" or any other descriptive class used by manufacturers to classify their products. The value is intended to help users quickly understand the primary function or form factor of the item.
Home & Home Office
Embedded options available
Indicates whether the product includes embedded options such as firmware features, hardware modules or configuration settings that are built into the device and available for use without external accessories.
No
Ethernet LAN data rates
Maximum theoretical speed at which a device can send or receive data over its Ethernet LAN interface, expressed in megabits per second (Mbps) or gigabits per second (Gbps). It represents the upper bound of throughput under optimal conditions and is useful for comparing network performance between devices with wired connectivity.
1000 Mbit/s
Ethernet LAN ports
Represents the total count of Ethernet LAN (RJ‑45) interfaces available on a product. The value is an integer indicating how many physical Ethernet ports are present, regardless of speed or generation.
1
Execution units
Represents the count of independent execution units within a processor or similar component. The value is an integer without any unit of measure, indicating how many discrete execution cores or threads are available for parallel processing.
12
Fan diameter
The linear measurement across the widest part of a fan, expressed in units such as millimeters (mm), centimeters (cm) or inches (in). It represents the overall width of the fan and is useful for determining fit, compatibility with cases, and airflow characteristics.
7 cm
Flash memory
The total amount of internal flash memory available in a device, expressed as a data size (e.g., megabytes or gigabytes). This attribute indicates how much data can be stored on the device’s built‑in flash storage and is useful for comparing storage capacity across products.
4000 MB
Harmonized System HS code
The Harmonized System (HS) code is a standardized numerical identifier used internationally to classify traded goods. It consists of up to six digits, where each pair of digits represents progressively more specific product categories. The HS code facilitates customs duties, trade statistics, and regulatory compliance by providing a common language for describing products across borders.
84714100
HDMI version
The specific version of the HDMI standard that a product supports, such as "2.0", "2.1" or "1.4b". This value indicates the capabilities and compatibility of the HDMI interfaces on the device.
2.0
Intel Identity Protection Technology version
Indicates the specific version number of Intel’s Identity Protection Technology that a product supports or implements. The value is typically a numeric string such as "1.00" or "0.00", representing the major and minor revision of the feature set.
1.00
Intel Smart Response Technology version
The specific version of Intel Smart Response Technology supported by the product, indicating its capability to accelerate disk performance using cache memory. The value is typically a decimal number such as 1.00 or 0.00 that represents the feature level enabled on the device.
0.00
Internal memory
The total amount of internal memory available in a device, expressed as a data size such as megabytes (MB) or gigabytes (GB). It indicates how much information the component can hold for active processes and affects multitasking performance.
4 GB
LED indicators
A list of the functions or statuses that an LED indicator on a device can display, such as power status, activity, link, and other operational signals.
HDD, LAN, Power, Status, USB
Maximum displays supported
The maximum count of external or internal display units that a device can drive simultaneously. This value indicates how many monitors, screens, or video outputs the system is capable of supporting at once.
3
Maximum internal memory supported by processor 8 GB
Maximum PCI Express lanes
Cantidad total de líneas (lanes) de la interfaz PCI Express disponibles en un dispositivo o placa base. Cada línea permite el flujo de datos entre el procesador y los dispositivos conectados, por lo que este número indica la capacidad máxima de ancho de banda para tarjetas y periféricos compatibles con PCIe.
6
Memory form factor
The physical configuration or size classification of a memory module, such as SO‑DIMM, UDIMM, RDIMM, or on‑board. It indicates the form factor that determines compatibility with motherboards and other hardware components.
SO-DIMM
Memory slots
The number of physical memory slots that are present and available for installing RAM modules in a device. This count indicates how many separate memory sticks can be installed or upgraded.
2
Memory types supported by processor DDR4-SDRAM, LPDDR4-SDRAM
Noise Level 16.7 dB
Number of screws
The total count of individual screws included with a product or component. It indicates how many separate screw units are provided for assembly, mounting, or securing parts, regardless of size or type.
14
On-board graphics adapter base frequency
The clock speed at which the integrated graphics processor runs under normal conditions, expressed in hertz (Hz). It indicates how many cycles per second the GPU performs and is useful for comparing visual performance across devices that use an on‑board graphics solution.
250 MHz
On-board graphics adapter burst frequency 700 MHz
On-board graphics adapter DirectX version
The version number of the DirectX graphics API supported by a device, indicating its compatibility with graphical features and software that rely on specific DirectX releases.
12.0
On-board graphics adapter ID
The unique identifier of the integrated graphics adapter built into a device, typically expressed as a hexadecimal string such as "0x5916" or a numeric code like "1916". This value allows users and systems to distinguish between different GPU models and versions across laptops, desktops, and motherboards.
0x3185
Onboard graphics adapter model
The model name or number of the integrated graphics adapter built into a device, such as a laptop or motherboard. It identifies the specific GPU variant used for rendering and video processing, allowing users to compare visual performance and compatibility across products.
Intel® UHD Graphics 600
Operating relative humidity
The range of relative humidity (in percentage) within which the product is designed to operate reliably. Values are expressed as a minimum–maximum interval such as "20 - 80 %" and indicate the acceptable environmental moisture level for optimal performance.
5 - 95%
Operating system installed
The operating system that is installed on the device, indicating the software platform that manages hardware resources and provides services for applications. It can be a commercial OS such as Windows or macOS, an open‑source distribution like Linux, or a proprietary firmware used in embedded devices.
QNAP QTS
Operating temperature
The range of temperatures in which a product can safely operate without risk of damage or performance degradation. Values are expressed in degrees Celsius (°C) and may represent a single temperature, a minimum–maximum interval, or an average operating point.
0 - 40 °C
PCI Express configurations
A textual description of how PCI Express lanes are distributed across the available slots or interfaces in a device. The value typically lists groups of lanes separated by commas, where each group may contain a number of lanes and optional ‘+’ signs to indicate combined lanes that share the same speed (e.g., "1x16", "2x8", "1x8+2x4"). This attribute helps users understand the bandwidth capacity and compatibility of expansion slots.
1x2, 1x2+2x1, 1x4, 2x1, 4x1
Power consumption 15.25 W
Power consumption sleep 8.08 W
Power supply location
The physical position where the power supply unit is installed or mounted within a device, such as top, bottom, rear, side, front, or built‑in. This attribute helps users understand where to find the power source and plan cable routing or ventilation.
External
Power supply unit PSU capacity
The electrical power rating of a power supply unit (PSU), expressed in watts (W). It indicates the maximum output power that the PSU can deliver to connected components, helping users assess compatibility and energy requirements for their system.
65 W
Processor ARK ID
The unique numeric identifier assigned by Intel to each processor model, used for precise identification and lookup of technical specifications.
128992
Processor boost frequency
The highest clock speed a processor can reach when its turbo or boost feature is active, expressed in hertz (Hz). This value indicates the peak performance capability of the CPU under load and helps users compare how fast a processor can run beyond its base clock speed.
2.7 GHz
Processor codename Gemini Lake
Processor family
The processor family identifies the group or series of CPU models that share a common architecture, design, and performance characteristics. It helps users compare processors across brands and generations by indicating the underlying technology used in the chip.
Intel® Celeron®
Processor operating modes
The set of instruction set architectures or execution modes that a processor can operate in, such as 32‑bit or 64‑bit. This attribute lists the supported modes for the CPU and helps users determine compatibility with software that requires a specific bitness.
64-bit
Processor package size
The overall dimensions of a processor’s physical package, expressed as length × width × height in millimetres or inches. It indicates the size that must fit within a motherboard socket or mounting area and helps users compare compatibility across different CPU models.
25 x 24 mm
Processor socket
The physical connector used by a processor to attach to a motherboard or compatible platform, such as LGA 1151, BGA 1440, Socket AM4, or LGA 1200. This attribute indicates the exact socket designation required for proper CPU installation and compatibility with other hardware components.
BGA 1090
RAID levels
A comma‑separated list that specifies the RAID configurations supported by a storage controller or device. Each entry can be a numeric level (e.g., 0, 1, 5, 10) or a special label such as JBOD. This attribute indicates which disk arrangements the system can manage.
0, 1, JBOD
Security algorithms
A list of cryptographic and authentication methods that a device can use for secure communication or data protection. Each entry represents a distinct algorithm or protocol, such as encryption ciphers (e.g., AES, WEP), authentication mechanisms (e.g., RADIUS, WPA‑PSK), or network security protocols (e.g., HTTPS, SSL/TLS). The values are typically separated by commas and may include both technical identifiers and consumer‑friendly labels.
256-bit AES, FIPS 140-2, SNMPv3, SSH, SSL/TLS
Share folder
A list of network file‑sharing protocols that the device can use to expose shared folders or drives. Common values include CIFS/SMB, AFP, NFS, FTP, and WebDAV. The attribute helps users understand which remote access methods are available for mounting or accessing storage on the device.
CIFS/SMB, FTP, WebDAV
Storage drive sizes supported
A list of the physical sizes and types of storage drives that a product can accommodate, such as 2.5‑inch, 3.5‑inch, or M.2. The values are typically separated by commas and may include additional descriptors like "M.2" to indicate an internal solid‑state drive interface.
3.5"
Storage temperature
The range of temperatures in which a device can safely operate without risk of damage or performance degradation. Values are expressed in degrees Celsius (°C) and may represent a single temperature, a minimum–maximum interval, or an average operating point.
-20 - 70 °C
Supported file systems
A comma‑separated list of file system formats that the product can read or write, such as FAT32, NTFS, ext4, exFAT, HFS+, and others. Each value represents a distinct storage format supported by the device’s firmware or operating system.
FAT32, HFS+, NTFS, ext3, ext4
Supported storage drive interfaces
List of physical or logical interfaces that allow an internal storage drive to communicate with the system, such as SATA, M.2 PCIe, U.2, SAS, NVMe, or other standard connections.
Serial ATA II, Serial ATA III
Supported storage drive types
A list of the types of storage drives that a product can use, such as HDD or SSD. Each entry indicates a distinct drive type supported by the device, allowing users to understand which internal or external storage media are compatible.
HDD & SSD
Thermal design power
The maximum amount of power, expressed in watts (W), that a processor or other electronic component is designed to dissipate as heat under typical operating conditions. It represents the thermal load the cooling system must handle and is used by manufacturers and users to assess performance, energy consumption, and suitability for specific environments.
10 W
Tjunction
The maximum ambient temperature at which the product can safely operate without risk of damage or performance degradation.
105 °C
Windows operating systems supported
A list of Microsoft Windows operating system versions that the product is compatible with, including any relevant architecture or edition information.
Windows 10, Windows 7, Windows 8
QNAP

QNAP is a Taiwanese technology company that produces network-attached storage (NAS) devices. The company was founded in 2004 and is headquartered in Taipei. QNAP's products are used by consumers, small businesses, and enterprises, and include NAS devices, surveillance solutions, and cloud storage services.