About This Guide.......................................................................................................................................... 3
About the TS-251D....................................................................................................................................... 4
Front Panel...............................................................................................................................................7
Left Panel................................................................................................................................................. 8
Setting Up the NAS.......................................................................................................................................9
Installing QTS Using Qfinder Pro........................................................................................................... 31
Installing QTS Using the Cloud Key....................................................................................................... 32
Installing QTS Using an HDMI Connection............................................................................................ 33
4. Basic Operations
Power Button.............................................................................................................................................. 35
GNU Public License....................................................................................................................................41
CE Notice....................................................................................................................................................49
This guide provides information on the QNAP TS-251D 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-251D User Guide
2. Product Overview
This chapter provides basic information about the QNAP TS-251D NAS.
About the TS-251D
The TS-251D is powered by an Intel® Celeron® J4005 dual-core 2.0 GHz processor with burst frequency up
to 2.7 GHz. The TS-251D supports up to 8 GB of DDR4 RAM and features USB One Touch Copy, a Gigabit
LAN port, and a PCIe slot. With Intel® AES-NI 256 hardware-accelerated encryption engine, the TS-251D
ensures the security of sensitive data and protects important information stored on the NAS.
Hardware Specifications
Warning
• If your QNAP product has hardware defects, return the product to QNAP or a QNAPauthorized service center for maintenance or replacement. Any attempt to repair or
perform maintenance procedures on the product by you or an unauthorized third-party
invalidates the warranty.
• QNAP is not responsible for any damage or data loss caused by unauthorized
modifications and installation of unsupported third-party applications.
For details, see the QNAP Warranty Terms and Conditions.
• 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.
Maximum memory8 GB RAM: 2 x 4 GB
Flash memory4 GB (Dual-boot OS protection)
Product Overview 4
ComponentTS-251D-2GTS-251D-4G
Storage
Drive bays2 x 3.5-inch SATA 6 Gbps
Tip
The drive bays are backward compatible with 3.5-inch
SATA 3 Gbps drives.
Drive compatibility3.5-inch bays:
• 3.5-inch SATA hard disk drives
• 2.5-inch SATA hard disk drives
• 2.5-inch SATA solid-state drives
SSD cache acceleration support3.5-inch drive bays 1 to 2
Hot-swappingSupported
Network
Gigabit Ethernet ports1 x GbE RJ45
External I/O Ports & Expansion Slots
PCIe slots1 x PCIe 2.0 x4
TS-251D User Guide
Tip
For the list of compatible expansion cards, go to
https://www.qnap.com/compatibility.
USB portsFront:
1 x USB 3.0 Type-A
Note
This USB port supports One Touch Copy.
Rear:
• 3 x USB 2.0 Type-A
• 1 x USB 3.0 Type-A
HDMI ports1 x HDMI 2.0 (up to 3840 x 2160 resolution at 60Hz)
Interface
IR sensor1
Note
The QNAP RM-IR004 remote control is an optional
separate purchase.
Buttons• Power
• Reset
• USB One Touch Copy
Dimensions
Form factorTower
Dimensions (H x W x D)168 x 105 x 226 mm
(6.61 x 4.13 x 8.90 in)
Product Overview 5
ComponentTS-251D-2GTS-251D-4G
Net weight1.48 kg (3.26 lbs)
Others
Power supply unit65W, 100-240V AC, 50/60 Hz
Warning
To reduce the risk of fire or electric shock, ensure that
you only connect the power cord to a properly
grounded electrical outlet.
System batteryCR2032 lithium battery (3V, 225 mAh)
Warning
To avoid potential battery explosion, causing injury or
damage to components, ensure that you replace the
existing battery with a battery of the same type.
Important
Dispose of used batteries according to local
regulations or the instructions of the battery
manufacturer.
TS-251D User Guide
Sound level16.7 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.
FansSystem: 1 x 70 mm, 12V DC fan
Warning
To avoid potential injury or damage to components, do
not touch the fans 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 95%
• Wet-bulb temperature: 27˚C (80.6˚F)
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-251D1
AC power adapter1
Power cord1
Ethernet cableCat5e cable: 1
Screws for 3.5-inch drives8
Product Overview 6
ItemQuantity
Screws for 2.5-inch drives6
Quick Installation Guide (QIG)1
Components
Front Panel
TS-251D User Guide
No.ComponentNo.Component
1Power button5Drive 1 LED
2Status LED6Drive 2 LED
3LAN LED7USB 3.0 One Touch Copy Type-A port
4USB One Touch Copy LED8USB One Touch Copy button
Product Overview 7
Left Panel
TS-251D User Guide
No.ComponentNo.Component
1PCIe 2.0 x4 slot3Memory slot 1
2Memory slot 2--
Rear Panel
No.ComponentNo.Component
1Ethernet Port (RJ45)6USB 3.0 Type-A port
2Gigabit Ethernet LEDs7HDMI 2.0 port
3Kensington security slot8Reset button
Product Overview 8
No.ComponentNo.Component
4Power input9PCIe low-profile cover
5USB 2.0 Type-A ports--
Drive Numbering
TS-251D 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 without exposure to direct sunlight, liquids,
or chemicals
• Free from objects that may obstruct NAS ventilation or apply
pressure to the NAS or power cord
Hardware and peripherals• Storage drives
For the list of compatible drive models, go to https://
www.qnap.com/compatibility.
• Network cable
Tools• Phillips #1 or #2 screwdriver
• Flat head screwdriver
• Anti-static wrist strap
Setting Up the NAS
Product Overview 9
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 Hard Drives or Solid-State Drives on 3.5-inch Trays
3. Connect the power cord and all applicable cables.
4. Power on the NAS.
5. Install QTS.
For details, see QTS Installation.
6. Log on to QTS.
TS-251D User Guide
Product Overview 10
TS-251D 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-251D is compatible with 3.5-inch hard drives, 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 locking mechanism on the left side of the NAS.
b. Slide the lock down to release the front cover.
c. Slide the front cover to the left and then pull.
d. Remove the cover.
Installation and Configuration 11
TS-251D 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-251D User Guide
b. Attach the fastening panels to lock the drive to the tray.
c. Attach the screws.
Installation and Configuration 13
TS-251D User Guide
5. Slide the tray into the drive bay.
6. Attach the front cover.
a. Align the front cover with the grooves on the case and then slide to the right.
Installation and Configuration 14
TS-251D User Guide
b. Slide the lock up to secure the front cover.
7. Power on the NAS.
Installing 2.5-inch Hard Drives or Solid-State 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
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