About This Guide.......................................................................................................................................... 3
About the TS-251B....................................................................................................................................... 4
Front Panel...............................................................................................................................................7
Left Panel................................................................................................................................................. 8
Setting Up the NAS.......................................................................................................................................9
Installing QTS Using Qfinder Pro........................................................................................................... 34
Installing QTS Using the Cloud Key....................................................................................................... 35
Installing QTS Using an HDMI Connection............................................................................................ 37
4. Basic Operations
Power Button.............................................................................................................................................. 39
GNU Public License....................................................................................................................................45
CE Notice....................................................................................................................................................53
This guide provides information on the QNAP TS-251B NAS and step-by-step instructions on installing the
hardware. It also provides instructions on basic operations and troubleshooting information.
Audience
This document is intended for consumers and storage administrators. This guide assumes that the user has
a basic understanding of storage and backup concepts.
Document Conventions
SymbolDescription
Notes provide default configuration settings and other supplementary
information.
Important notes provide information on required configuration settings and other
critical information.
Tips provide recommendations or alternative methods of performing tasks or
configuring settings.
Warnings provide information that, when ignored, may result in potential loss,
injury, or even death.
Preface 3
TS-251B User Guide
2. Product Overview
This chapter provides basic information about the QNAP TS-251B NAS.
About the TS-251B
The TS-251B is powered by an Intel® Celeron® J3355 dual-core 2.0 GHz processor with burst frequency of
up to 2.5 GHz. The TS-251B supports up to 8 GB of DDR3L RAM and features USB One Touch Copy, a
Gigabit LAN port, and a PCIe slot. With a hardware-accelerated encryption engine, the TS-251B ensures the
security of sensitive data and protects any important information that is stored on the NAS.
Hardware Specifications
Important
Modifying the hardware or software of your QNAP product invalidates the warranty. QNAP
is not responsible for any damage or data loss caused by unauthorized modifications and
installation of unsupported third-party accessories or applications.
ComponentTS-251B
Ordering Information
Ordering P/N• TS-251B-2G
• TS-251B-4G
Processor
CPUIntel® Celeron® J3355
FrequencyDual-core 2.0 GHz base/2.5 GHz turbo
Architecture64-bit x86
Encryption engineAES-NI
Memory
Pre-installed memory• 2 GB RAM: 1 x 2 GB DDR3L
• 4 GB RAM: 1 x 4 GB DDR3L
Important
• Use only QNAP memory modules to maintain
system performance and stability. For NAS devices
with more than one memory slot, use QNAP
modules with identical specifications.
• Using unsupported modules may degrade
performance, cause errors, or prevent the
operating system from starting.
Total memory slots2 x SODIMM DDR3L
Maximum memory8 GB RAM: 2 x 4 GB
Flash memory4 GB eMMC
Storage
Drive bays• 2 x 3.5-inch SATA 6 Gbps
Product Overview 4
ComponentTS-251B
Drive compatibility• 3.5-inch SATA hard disk drives
• SSDs using PCIe expansion slots are not hotswappable.
Network
Gigabit Ethernet ports1 x Gigabit RJ45
External I/O Ports & Expansion Slots
PCIe slots1 x PCIe 2.0 x2
USB ports• Front: 1 x USB 3.0 Type-A
TS-251B User Guide
Note
You can use the One Touch Copy button with this port.
• Rear: 4 x USB Type-A:
• 3 x USB 2.0 Type-A
• 1 x USB 3.0 Type-A
HDMI outputs1 x HDMI v1.4b (Supports up to 3840 x 2160 @ 30 Hz)
Audio• 2 x 3.5 mm dynamic microphone jacks
• 1 x 3.5 mm line-out jack
• 1 x speaker
Note
You cannot use the speaker and the line-out jack
simultaneously.
Interface
Buttons• Power
• Reset
• USB One Touch Copy
IR sensor1
Note
The QNAP RM-IR004 remote control is an optional
separate purchase.
Product Overview 5
ComponentTS-251B
Dimensions
Form factorTower
Dimensions (H x W x D)168 x 105 x 226 mm (6.62 x 4.13 x 8.90 in)
Net weight1.53 kg (3.37 lbs)
Other
Power supply unit65W, 100-240V AC, 50/60 Hz
System batteryCR2032 lithium battery (3V, 225 mAh)
Warning
To avoid potential injury or damage to components,
make sure to replace the existing battery with a battery
of the same type.
Sound level17.3 dB(A)
Note
The sound level was tested at a bystander position,
which is within one meter of the NAS. The test NAS
operated at low speed with the maximum number of
drives installed.
TS-251B User Guide
FansSystem: 1 x 70 mm
Warning
To avoid potential injury or damage to components, do
not touch the fan while the NAS is connected to a
power source.
Operating temperature0˚C to 40˚C (32˚F to 104˚F)
Relative humidity• Non-condensing relative humidity: 5% to 90%
• Wet-bulb temperature: 27˚C (80.6˚F)
Security slotKensington security slot
Tip
Model specifications are subject to change without prior notice. To see the latest
specifications, go to https://www.qnap.com.
Package Contents
ItemQuantity
TS-251B NAS1
AC power adapter1
Power cord1
Ethernet cable1
Screws for 3.5-inch drives8
Screws for 2.5-inch drives6
Quick Installation Guide (QIG)1
Components
Product Overview 6
Front Panel
TS-251B User Guide
No.ComponentNo.Component
1Power button5Drive 1 LED
2Status LED6Drive 2 LED
3LAN LED7USB One Touch Copy port
4USB LED8USB One Touch Copy button
Rear Panel
No.ComponentNo.Component
1Speaker7HDMI 1.4b port
Product Overview 7
TS-251B User Guide
No.ComponentNo.Component
2Kensington security slot83.5 mm line-out jack
3Power input93.5 mm dynamic microphone jacks
4USB 2.0 Type-A ports10Reset button
5USB 3.0 Type-A port11PCIe low-profile cover
6Gigabit Ethernet RJ45 port--
Left Panel
No.ComponentNo.Component
1PCIe 2.0 x2 slot3Memory slot 2
2Memory slot 1--
Product Overview 8
Drive Numbering
TS-251B User Guide
Installation Requirements
CategoryItem
Environment• Room temperature: 0˚C to 40˚C (32˚F to 104˚F)
• Non-condensing relative humidity: 5% to 95%
• Wet-bulb temperature: 27˚C (80.6˚F)
• Flat, anti-static surface with no exposure to direct sunlight, liquids,
or chemicals
Hardware and peripherals• Storage drives
For details on compatible drives, go to https://www.qnap.com/
compatibility/.
• Network cable
Tools• Phillips #1 or #2 screwdriver
• Anti-static wrist strap
Setting Up the NAS
1. Place your NAS device in an environment that meets the requirements.
For details, see Installation Requirements.
2. Install the drives.
For details, see the following topics:
• Installing 3.5-inch Hard Drives on 3.5-inch Trays
• Installing 2.5-inch Drives on 3.5-inch Trays
3. Connect the power cord and all applicable cables.
Product Overview 9
4. Power on the NAS.
5. Install QTS.
For details, see QTS Installation.
6. Log on to QTS.
TS-251B User Guide
Product Overview 10
TS-251B User Guide
3. Installation and Configuration
This chapter provides specific hardware and firmware installation and configuration steps.
Hardware Installation
This section provides information on installing drives, memory modules, and expansion cards.
Drive Installation
The TS-251B is compatible with 3.5-inch and 2.5-inch hard drives and 2.5-inch solid-state drives.
Installing 3.5-inch Hard Drives on 3.5-inch Trays
Warning
• Installing a drive deletes all data on the drive.
• Observe electrostatic discharge (ESD) procedures to avoid damage to components.
1. Power off the NAS.
2. Remove the front cover.
a. Locate the lock on the left side of the NAS.
b. Slide the lock down to release the cover.
c. Slide the cover to the left.
d. Remove the cover.
Installation and Configuration 11
TS-251B User Guide
3. Remove a drive tray by simultaneously pressing the latch and pulling the tray.
4. Install a drive on the tray.
a. Remove the fastening panels from the sides of the drive tray.
Installation and Configuration 12
TS-251B User Guide
b. Place the drive on the tray so that the holes on the sides of the drive are aligned with the holes on
the sides of the tray.
c. Attach the fastening panels to lock the drive to the tray.
d. Optional: Attach screws to further secure the drive.
Installation and Configuration 13
TS-251B User Guide
5. Slide the tray into the drive bay.
6. Attach the front cover.
a. Align the cover with the grooves on the case.
b. Slide the cover to the right.
Installation and Configuration 14
TS-251B User Guide
c. Slide the lock up.
7. Power on the NAS.
Installing 2.5-inch Drives on 3.5-inch Trays
Warning
• Installing a drive deletes all data on the drive.
• Observe electrostatic discharge (ESD) procedures to avoid damage to components.
1. Power off the NAS.
2. Remove the front cover.
Installation and Configuration 15
a. Locate the lock on the left side of the NAS.
b. Slide the lock down to release the cover.
TS-251B User Guide
c. Slide the cover to the left.
d. Remove the cover.
3. Remove a drive tray by simultaneously pressing the latch and pulling the tray.
Installation and Configuration 16
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