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QNAP TS-251+ Ethernet LAN Tower Black NAS
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Storage
Total installed storage capacity
4 TB
Online RAID migration
Yes
Online RAID expansion
Yes
Bad block scan
Yes
Storage drives installed
Yes
Installed storage drive type
HDD
Supported storage drive types
HDD & SSD
Number of storage drives supported
2
Hot-swap drive bays
Yes
RAID support
Yes
Supported file systems
FAT32-HFS+-NTFS-exFAT-ext3-ext4
RAID levels
0-1-JBOD
Supported storage drive interfaces
Serial ATA II- Serial ATA III
Storage drive sizes supported
2.5-3.5"
Processor
Processor frequency
2 GHz
Processor family
Intel® Celeron®
Processor cores
4
Memory
Internal memory type
DDR3L
Internal memory
2 GB
Memory clock speed
1600 MHz
Maximum RAM supported
8 GB
Memory slots
2x SODIMM
Flash memory
512 MB
Network
Link aggregation
Yes
Dynamic DNS (DDNS)
Yes
Ethernet LAN
Yes
Ethernet LAN data rates
10-100-1000 Mbit/s
Wi-Fi
No
Wake-on-LAN ready
Yes
Supported network protocols
CIFS/SMB- AFP v3.3- NFS v3- FTP- FTPS- SFTP- TFTP- HTTP(S)- Telnet- SSH- iSCSI- SNMP- SMTP- SMSC
Jumbo frames support
Yes
iSCSI support
Yes
DHCP server
Yes
DHCP client
Yes
Ports & interfaces
USB port
Yes
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity
2
USB 2.0 ports quantity
2
HDMI ports quantity
1
Ethernet LAN (RJ-45) ports
2
Hard drive
RAID support
Yes
Supported file systems
FAT32-HFS+-NTFS-exFAT-ext3-ext4
RAID levels
0-1-JBOD
Design
Cooling type
Active
Fan diameter
7 cm
Cable lock slot type
Kensington
Product colour
Black
Number of fans
1 fan(s)
LED indicators
HDD- LAN- Power- Status- USB
Chassis type
Tower
Cable lock slot
Yes
Technical details
Type
NAS
Device class
Home & Home Office
Backup function
Yes
Backup features
Cloud- USB drive- iSCSI LUN
Product colour
Black
Noise level
15.4 dB
LED indicators
HDD- LAN- Power- Status- USB
Chassis type
Tower
Buzzer
Yes
Number of simultaneous users
4096 user(s)
Number of fans
1 fan(s)
Performance
Built-in iTunes server
Yes
Built-in FTP server
Yes
System log
Yes
Share folder access right management
Yes
Share folder
512
S.M.A.R.T. support
Yes
Browser supported
Apple Safari 7+- Google Chrome- Microsoft Internet Explorer 10+- Mozilla Firefox
Mac compatibility
Yes
Remotely operated
Yes
Backup button
Yes
Universal Plug and Play (UPnP)
Yes
Type
NAS
Device class
Home & Home Office
Backup function
Yes
Backup features
Cloud- USB drive- iSCSI LUN
On/off switch
Yes
Windows operating systems supported
Windows 10-Windows 10 Education-Windows 10 Education x64-Windows 10 Enterprise-Windows 10 Enterprise x64-Windows 10 Home-Windows 10 Home x64-Windows 10 IOT Core-Windows 10 Pro-Windows 10 Pro x64-Windows 7-Windows 7 Enterprise-Windows 7 Enterprise x64-Windows 7 Home Basic-Windows 7 Home Basic x64-Windows 7 Home Premium-Windows 7 Home Premium x64-Windows 7 Professional-Windows 7 Professional x64-Windows 7 Starter-Windows 7 Starter x64-Windows 7 Ultimate-Windows 7 Ultimate x64-Windows 7 x64-Windows 8-Windows 8 Enterprise-Windows 8 Enterprise x64-Windows 8 Pro-Windows 8 Pro x64-Windows 8 x64
Server operating systems supported
Windows Server 2003-Windows Server 2008 R2-Windows Server 2012-Windows Server 2012 R2-Windows Server 2016
Mac operating systems supported
Mac OS X 10.7 Lion-Mac OS X 10.8 Mountain Lion-Mac OS X 10.9 Mavericks
Linux operating systems supported
Yes
Web-based management
Yes
Security algorithms
256-bit AES-FIPS 140-2-HTTPS-SSH
Reset button
Yes
Operating system version
4.3
Operating system installed
QNAP Turbo System
Noise level
15.4 dB
Management protocols
SNMP
Buzzer
Yes
Snapshot
Yes
Cooling
Cooling type
Active
Fan diameter
7 cm
Fan voltage
12 V
Number of fans
1 fan(s)
Security
Cable lock slot type
Kensington
Security algorithms
256-bit AES-FIPS 140-2-HTTPS-SSH
Cable lock slot
Yes
Software
Mac compatibility
Yes
Windows operating systems supported
Windows 10-Windows 10 Education-Windows 10 Education x64-Windows 10 Enterprise-Windows 10 Enterprise x64-Windows 10 Home-Windows 10 Home x64-Windows 10 IOT Core-Windows 10 Pro-Windows 10 Pro x64-Windows 7-Windows 7 Enterprise-Windows 7 Enterprise x64-Windows 7 Home Basic-Windows 7 Home Basic x64-Windows 7 Home Premium-Windows 7 Home Premium x64-Windows 7 Professional-Windows 7 Professional x64-Windows 7 Starter-Windows 7 Starter x64-Windows 7 Ultimate-Windows 7 Ultimate x64-Windows 7 x64-Windows 8-Windows 8 Enterprise-Windows 8 Enterprise x64-Windows 8 Pro-Windows 8 Pro x64-Windows 8 x64
Server operating systems supported
Windows Server 2003-Windows Server 2008 R2-Windows Server 2012-Windows Server 2012 R2-Windows Server 2016
Mac operating systems supported
Mac OS X 10.7 Lion-Mac OS X 10.8 Mountain Lion-Mac OS X 10.9 Mavericks
Linux operating systems supported
Yes
Operating system version
4.3
Operating system installed
QNAP Turbo System
Management features
On/off switch
Yes
Web-based management
Yes
Reset button
Yes
Management protocols
SNMP
Power
Power consumption (HDD standby)
10.56 W
Power supply location
External
Power supply unit (PSU) capacity
60 W
Fan voltage
12 V
AC input voltage
100 - 240 V
Power consumption (typical)
18.09 W
Power consumption (sleep)
0.57 W
External power adapter
Yes
Weight & dimensions
Width
102 mm
Depth
219 mm
Height
169 mm
Weight
1.28 kg
Package weight
2.32 kg
Packaging content
Number of screws
14
Handheld remote control
Yes
Quick installation guide
Yes
External power adapter
Yes
Cables included
AC- LAN (RJ-45)
System requirements
Windows operating systems supported
Windows 10-Windows 10 Education-Windows 10 Education x64-Windows 10 Enterprise-Windows 10 Enterprise x64-Windows 10 Home-Windows 10 Home x64-Windows 10 IOT Core-Windows 10 Pro-Windows 10 Pro x64-Windows 7-Windows 7 Enterprise-Windows 7 Enterprise x64-Windows 7 Home Basic-Windows 7 Home Basic x64-Windows 7 Home Premium-Windows 7 Home Premium x64-Windows 7 Professional-Windows 7 Professional x64-Windows 7 Starter-Windows 7 Starter x64-Windows 7 Ultimate-Windows 7 Ultimate x64-Windows 7 x64-Windows 8-Windows 8 Enterprise-Windows 8 Enterprise x64-Windows 8 Pro-Windows 8 Pro x64-Windows 8 x64
Server operating systems supported
Windows Server 2003-Windows Server 2008 R2-Windows Server 2012-Windows Server 2012 R2-Windows Server 2016
Mac operating systems supported
Mac OS X 10.7 Lion-Mac OS X 10.8 Mountain Lion-Mac OS X 10.9 Mavericks
Linux operating systems supported
Yes
Operational conditions
Operating temperature (T-T)
0 - 40 °C
Operating relative humidity (H-H)
5 - 95%
Packaging data
Package weight
2.32 kg
Cables included
AC- LAN (RJ-45)
Other features
Number of simultaneous users
4096 user(s)
QNAP TS-251+ Ethernet LAN Tower Black NAS
| Length | 21.90 in |
| Width | 10.20 in |
| Height | 16.90 in |
| Weight | 1.280000 lbs |
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