HS‑251 SilentStream 2‑Bay NAS
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| Identifiers | |
|---|---|
| Model | QNAP HS-251 |
| MPN | QNAP HS-251 |
| Dimensions / Weight | |
| Key Features | |
|
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 |
|
Backup function Indicates whether a device has the capability to create backups of its data or settings, allowing restoration in case of loss, failure, or interruption.
|
Yes |
|
Built-in display Indicates whether the product includes a built‑in screen or display unit that can be used directly for viewing content, such as a monitor on a laptop, an integrated display on a device, or a built‑in screen on appliances. A value of "Yes" means the product has such a display; "No" means it does not.
|
No |
| Buzzer | Yes |
|
Cable lock slot Indicates whether the product includes a slot for inserting a cable lock, such as a Kensington or similar security device.
|
Yes |
|
Cable lock slot type The specific type of cable lock interface that a device provides for securing cables, such as Kensington, Noble, IBM or other standard locking mechanisms.
|
Kensington |
| Cabling technology | 10/100/1000Base-T(X) |
|
Card reader integrated Indicates whether the device includes a built‑in card reader that can read removable memory cards such as SD, microSD, MMC or similar formats.
|
No |
|
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.
|
Desktop |
|
Cooling type The method used to dissipate heat from a component or system, such as active cooling (fans or liquid loops), passive heat sinks, or no active cooling. It indicates whether the product relies on airflow, conduction, or other mechanisms to maintain safe operating temperatures.
|
Passive |
|
Depth The linear measurement of an object from front to back or top to bottom, expressed in a physical unit such as millimeters, centimeters, inches, etc. It indicates how deep the item is and can be used for fitting, compatibility, or spatial planning.
|
220 mm |
|
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 |
|
DHCP Client Indicates whether the device supports the DHCP client function, meaning it can automatically request an IP address and related network settings from a DHCP server.
|
Yes |
|
DHCP server Indicates whether the device supports acting as a DHCP server, allowing it to assign IP addresses and network configuration settings to clients on the network.
|
Yes |
|
Ethernet LAN Indicates whether the product has an Ethernet interface for wired network connectivity, allowing data transmission over RJ‑45 or compatible cables.
|
Yes |
|
External power adapter Indicates whether the product comes with an external power adapter in its packaging. A value of "Yes" means a charger is supplied; a value of "No" means no charger is included and the user must obtain one separately.
|
Yes |
|
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.
|
512 MB |
| HDMI ports quantity | 1 |
|
Height The vertical dimension of a product measured from its lowest to highest point. It is expressed in a physical unit such as millimetres, centimetres or inches and applies to any item where height is relevant, including books, electronics, furniture and other objects.
|
41.3 mm |
|
Hot-swap drive bays Indicates whether the product’s drive bays support hot‑swap, meaning drives can be inserted or removed while the device is powered on without shutting down or rebooting.
|
Yes |
|
Internal memory type The type of memory physically installed inside a device, such as DDR4 SDRAM, LPDDR3, or other RAM variants. It indicates the architecture and generation of the internal memory modules that the product uses or supports.
|
DDR3L |
| iSCSI support | Yes |
| Jumbo frames support | Yes |
|
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.
|
Yes |
|
Linux operating systems supported List of Linux operating systems that the product is compatible with, including specific versions and architectures when relevant. Each value represents a distinct Linux distribution or kernel version supported by the hardware or software.
|
Yes |
|
Mac operating systems supported A list of macOS operating system versions that the product supports or is compatible with, such as "macOS 10.15 Catalina", "macOS 11 Big Sur" or newer releases. Each entry represents a distinct OS version that can run on or be supported by the device.
|
Yes |
|
Management protocols A list of network protocols that a device can use for configuration, monitoring and remote management, such as SNMP, HTTP/HTTPS, Telnet, SSH or other standard interfaces. Each protocol is represented by its common name and may be separated by commas or slashes in the source data.
|
SNMP, Telnet |
|
Multilingual support Indicates whether a product supports multiple languages for its user interface, documentation or help resources. A value of "Yes" means the device offers language options beyond the default; "No" indicates it is limited to a single language.
|
Yes |
|
Number of storage drives supported The total count of individual storage drives that a product can accommodate or support. This includes internal and external hard disks, solid‑state drives, or other removable media devices. The value is an integer representing how many separate drive units the system can host, install, or connect.
|
2 |
|
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 Turbo System |
|
Operating system version The specific version of the operating system that a product supports or runs, expressed as a numeric revision (e.g., 10, 11) or a descriptive name (e.g., Nougat). This attribute helps users determine compatibility with software and updates.
|
4.1 |
|
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 frequency The fundamental operating frequency of a processor, expressed in hertz (Hz). It indicates the speed at which the CPU runs under normal conditions and is typically reported in gigahertz (GHz) or megahertz (MHz). This value helps users compare performance potential across different models.
|
2.41 GHz |
|
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 |
|
RAID support A comma‑separated list of RAID levels that a storage device or controller can support, such as 0, 1, 5, 10, JBOD, and other proprietary configurations. Each value represents a distinct RAID mode the system is capable of creating or managing.
|
Yes |
|
Reset button Indicates whether the device has a physical reset button that restores factory settings or original configuration when pressed.
|
Yes |
|
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,HTTPS,SSH,SSL/TLS |
|
Server operating systems supported A list of operating systems that the product can run or support, including specific versions and architectures when relevant. Each value represents a distinct OS that is compatible with the hardware or software.
|
Windows Server 2003 |
|
Storage drive size A list of the physical drive sizes that are compatible with the product, such as "2.5"", "3.5"", and "M.2". This attribute helps users determine which external or internal drives can be used with the device.
|
2.5/3.5" |
|
Storage drives installed The total count of individual storage devices (hard disk drives or solid‑state drives) that are physically present in the product. It indicates how many separate drives are installed, regardless of capacity or interface type.
|
No |
|
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.
|
ext3,ext4,FAT32,HFS+,NTFS |
|
Supported network protocols A list of network communication protocols that a device can use or support, such as TCP/IP, HTTP, HTTPS, FTP, DHCP, DNS, and various wireless standards. Each protocol is represented by its standard name and may be separated by commas or slashes in the source data.
|
CIFS/SMB,AFP (v3.3), NFS(v3), FTP, FTPS, SFTP, TFTP, HTTP(S), Telnet, SSH, iSCSI, SNMP, SMTP, SMSC |
|
Supported storage drive types A list of the types of storage drives that a product can accommodate or use, such as HDD, SSD, or hybrid configurations. Each entry indicates a distinct drive type that is supported by the device’s bays, slots, or external interfaces.
|
HDD,SSD |
|
Type The general category or style of the product, such as laptop, printer cartridge, or cooling fan. It helps buyers quickly identify the nature of the item and compare similar products.
|
NAS |
|
Wake-on-LAN ready Indicates whether the device can be powered on remotely via Wake‑on‑LAN, allowing a network administrator or user to start it from sleep or off state using a network packet.
|
Yes |
|
Web-based management Indicates whether the product can be configured and monitored through a web interface accessible via a browser, allowing remote administration over a local or internet connection.
|
Yes |
|
Weight The mass of the product expressed in a standard unit such as grams or kilograms. It represents how heavy the item is and can be used for shipping calculations, handling instructions, or consumer information.
|
1.56 kg |
|
Width The horizontal measurement of a product, expressed in a linear unit such as millimetres or inches. It indicates how wide the item is from one side to the other and is used for sizing, fitting, and compatibility purposes.
|
302 mm |
|
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.
|
Yes |

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.











