QNAP TS-251D User Manual

4. Basic Operations
This chapter describes basic NAS operations.
Power Button
Operation User Action Result
Power on Press the button once. The NAS powers on.
Power off Press and hold the button for 1.5
seconds.
The NAS powers off.
Force power off Press and hold the button for 5
seconds.
The NAS shuts down.
Important
Use this method only
when the NAS is
unresponsive.
Reset Button
Operation User Action Result
Basic system reset Press and hold the
button for 3 seconds.
The following settings are reset to default:
• System administrator password: admin
• TCP/IP configuration:
• Obtain IP address settings automatically via
DHCP
• Disable jumbo frames
• If port trunking is enabled (multi-LAN models
only), the port trunking mode is reset to “Active
Backup (Failover)”.
• System port: 8080 (system service port)
• Security level: Low (Allow all connections)
• LCD panel password: (blank)
• VLAN: Disabled
Advanced system
reset
Press and hold the
button for 15 seconds.
The default factory settings are restored.
• To retrieve old data after an advanced system reset,
recreate the previous folder structure on the NAS.
USB One Touch Copy Button
The USB One Touch Copy button allows you to copy data backups from a USB device to the NAS or from
the NAS to a USB device.
This feature supports incremental backups. The NAS only copies files that were modified or added after the
last backup.
TS-251D User Guide
Basic Operations 36

QNAP TS-251D Specifications

General

Type	NAS
Noise level	16.7 dB
Device class	Home & Home Office
Share folder	CIFS/SMB, FTP, WebDAV
Backup features	Cloud, USB drive
Backup function	Yes
Browser supported	Apple Safari 7+, Google Chrome, Microsoft Internet Explorer 10+, Mozilla Firefox
Security algorithms	256-bit AES, FIPS 140-2, SNMPv3, SSH, SSL/TLS
Storage temperature (T-T)	-20 - 70 °C
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	5 - 95 %
Chassis type	Tower
Cooling type	Active
Fan diameter	70 mm
Product color	White
LED indicators	HDD, LAN, Power, Status, USB
Number of fans	1 fan(s)
Cable lock slot type	Kensington
Fiber ports quantity	0
USB 2.0 ports quantity	3
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity	2
Wi-Fi	No
Ethernet LAN data rates	1000 Mbit/s
Supported network protocols	TCP/IP, PTP, L2TP/IPSec, OpenVPN, QBelt(, FTP, SFTP, TFTP
Flash memory	4000 MB
Internal memory	4 GB
Memory form factor	SO-DIMM
Internal memory type	DDR4
Maximum RAM supported	8 GB
Cables included	AC, LAN (RJ-45)
Number of screws	14
Tjunction	105 °C
Processor cache	4 MB
Processor model	J4005
System bus rate	- GT/s
Processor family	Intel® Celeron®
Processor socket	BGA 1090
Processor codename	Gemini Lake
Processor frequency	2 GHz
Processor lithography	14 nm
Processor manufacturer	Intel
Processor package size	25 x 24 mm
Processor boost frequency	2.7 GHz
Processor operating modes	64-bit
PCI Express configurations	1x2, 1x2+2x1, 1x4, 2x1, 4x1
Thermal Design Power (TDP)	10 W
On-board graphics card model	Intel® UHD Graphics 600
Fan voltage	12 V
AC input voltage	100 - 240 V
AC input frequency	50 - 60 Hz
Power supply location	External
Power consumption (sleep)	8.08 W
Power consumption (typical)	15.25 W
Power supply unit (PSU) capacity	65 W
Operating system version	5.0.0
Operating system installed	QNAP QTS
Mac operating systems supported	Mac OS X 10.10 Yosemite, Mac OS X 10.11 El Capitan, Mac OS X 10.12 Sierra, Mac OS X 10.13 High Sierra, Mac OS X 10.14 Mojave, Mac OS X 10.15 Catalina, Mac OS X 10.7 Lion, Mac OS X 10.8 Mountain Lion, Mac OS X 10.9 Mavericks
Server operating systems supported	Windows Server 2003, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016, Windows Server 2019
Windows operating systems supported	Windows 10, Windows 7, Windows 8
RAID levels	0, 1, JBOD
Storage drive size	- \
Storage drive capacity	0 GB
Supported file systems	FAT32, HFS+, NTFS, ext3, ext4
Storage drive interface	-
Storage drive sizes supported	3.5 \
Supported storage drive types	HDD & SSD
Total installed storage capacity	0 TB
Supported storage drive interfaces	Serial ATA II, Serial ATA III
Number of execution units	12
Maximum number of PCI Express lanes	6
Memory types supported by processor	DDR4-SDRAM, LPDDR4-SDRAM
Intel Smart Response Technology version	0.00
Intel Identity Protection Technology version	1.00
On-board graphics card ID	0x3185
On-board graphics card base frequency	250 MHz
On-board graphics card DirectX version	12.0
On-board graphics card dynamic frequency (max)	700 MHz
Processor ARK ID	128992
Harmonized System (HS) code	84714100

Weight and Dimensions

Depth	226 mm
Width	105 mm
Height	168 mm
Weight	1480 g
Package weight	2580 g