TerraMaster U4 423 NAS scaled

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Today, TerraMaster has announced a new affordable NAS that will appeal to small businesses.

The TerraMaster U4-423 is a four-bay NAS, but rather than the desktop-style NAS products I have reviewed from them in the past, this is a rackmount NAS. It weighs just 3.2kg without drives and occupies just one rack unit being 40mm in height with a width of 440mm and a length of 360mm.

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It is a well-specced NAS with an Intel Celeron N5095 quad-core processor with 2.0 GHz and a maximum turbo of 2.9 GHz. It is integrated with a GPU graphics card, AES NI hardware encryption and equipped with two 2.5 GbE interfaces and 4 GB DDR4 dual-channel memory (expandable up to 32 GB).

The U4-423 is configured with two 2.5 GbE interfaces, supporting 2.5 GbE high-speed network bandwidth. Link Aggregation provides a network bandwidth of up to 5 Gb.

TerraMaster U4 423 NAS. multigigjpg

The transmission speed can reach 283 MB/s (Seagate IronWolf 18TB x 4, RAID 0), and you can also use the built-in M.2 NVMe for SSD cache acceleration which significantly increases the storage efficiency of the disk array.

As for disk array support, you can have Single, RAID 0, 1, 5, 6, 10. You can also set up a hot spare.

The NAS also has a two USB3.1 port capable of 10Gbps, and this allows you to expand the storage by paring the NAS up with the TerraMaster D6-320 USB3.2 Gen2 External Hard Disk Enclosure that was launched in March.

Price and Availability

TERRAMASTER U4-423 2.5GbE NAS Rackmount 1U 4-Bay High... TERRAMASTER U4-423 2.5GbE NAS Rackmount 1U 4-Bay High... No ratings yet £549.99Amazon Prime

The TerraMaster U4-423 4-bay rackmount NAS is available to buy now from Amazon stores internationally.

In the UK, the MSRP is £599.99, and you can buy it from Amazon here.

For US buyers, the MSRP price is $699.99 and is available from Amazon.com, but it is showing currently unavailable at the time of writing.


DE: https://amz.run/6bZo

FR: https://amz.run/6bZi


Full Specification

SpecificationTerraMaster U4-423
Processor ModelIntel® Celeron® N5095
Processor ArchitectureX.86 64-bit
Processor FrequencyQuad Core 2.0 GHz (Max burst up to 2.9 GHz)
CPU Single-Core Score/
Hardware Encryption Engine
Hardware Transcoding EngineH.264, H.265, MPEG-4, VC-1;maximum resolution: 4K (4096 x 2160); maximum frame rate per second (FPS): 60
System Memory4GB
Pre-installed Memory module4GB (1 x 4GB)
Total Memory Slot Number2 (DDR4 SODIMM)
Maximum Supported Memory32 GB (16GB+16GB)
NoteTerraMaster reserves the right to replace memory modules with the same or higher frequency based on supplier's product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance.
Disk Slot Number4
Compatible Drive types3.5" SATA HDD
Maximum Internal Raw Storage Capacity80TB (20TB x4) (Capacity may vary by RAID types)
Drive Hot Swap
Note . Hard drive vendors will release their latest models of hard drives, and Maximum internal raw storage capacity may be adjusted accordingly.
. The maximum single volume size is not directly related to the maximum raw capacity.
File System
Internal DriveBtrfs, EXT4
External DriveEXT3, EXT4, NTFS, FAT32, HFS+
External Ports
RJ-45 1GbE Network Jack/
RJ-45 2.5GbE Network Jack2
RJ-45 10GbE Network Jack/
 SFP+ 10GbE Network Jack/
USB3.1 Host Port2(10Gbps)
USB2.0 Host Port/
PCIe Slots/
M.2 2280 NVMe Slot
Size (H*W*D)45*440 *360  mm
Packaging Size (H*W*D)95*545 *453  mm 
Weight6.8 kg
System Fan40 x 40 x 28mm  3PCS
Fan ModeSmart, High speed, Middle speed, Low speed
Noise Level
Power Supply90W
Redundancy Power Supply/
AC Input Voltage100V - 240V AC
Current Frequency50/60 Hz, Single frequency
Power Consumption35.2W(Fully loaded Seagate 4TB ST4000VN008 hard drive(s) in read/write state) 
13.9 W (Fully loaded Seagate 4TB ST4000VN008 hard drive(s) in hibernation)
Limited warranty2 years
CertificateFCC, CE, CCC, KC
EnvironmentRoHS, WEEE
Working Temperature0°C  ~ 40°C (32°F ~ 104°F)
Storage Temperature-20°C ~ 60°C (-5°F ~ 140°F)
Relative Humidity5% ~ 95% RH
Package Contents
Host (x1)
Power cord (x1)
RJ-45 network cable (x1)
Quick Installation Guide (x1)
 Limited Warranty Note(x1)
Screws(a few)
TOS Features
OS Supported
Supported Client OSWindows OS, Mac OS, Linux OS
Supported Web BrowsersGoogle Chrome 97.0.xxxx, Mozilla Firefox 9.3,Apple Safari 12.1 ; Microsoft Edge 99.0.xx or later version.
Supported mobile OSiOS12.0, Android 9.0 or later version
Storage Management
Supported RAID TypesTRAID, Single, JBOD, RAID 0, RAID 1, RAID5, RAID 6, RAID 10
Maximum Internal Volume Number256
Maximum iSCSI Target128
Maximum iSCSI LUN256
Volume Expansion with Larger HDDsTRAID, RAID 1,RAID5,RAID 6,RAID10
Volume Expansion by Adding a HDDTRAID, RAID5,RAID6
RAID Migration
SSD Cache
Hot Spare
Hard Drive S.M.A.R.T.
Seagate IHM
NVRAM write cache(BBU-protected)/
Shared Folder Snapshot
LUN Snapshot/
File Services
Maximum Concurrent SMB/AFP/FTP/SFTP Connections500
Windows Access Control List (ACL) Integration
NFS Kerberos Authentication
Account & Shared Folder
Maximum local user's account number2048
Maximum local group number512
Maximum shared folders number512
Maximum shared folders syncing tasks8
Rsync Backup
Duple Backup
Centralized Backup
USB  Backup
Cloud Sync
Time Machine Backup
File System Snapshot
TFM Backup
Link Aggregation
DLNA Compliance
VPN Client
VPN Server
Proxy Client
Proxy Server/
UPnP/Bonjour Discovery
TNAS.online Remote Access
Access Right Management
Batch users creation/
Import/Export users
User Quota Managerment
Local user access control for CIFS/SAMBA and FTP
Domain Authentication
AD Domain
LDAP Client
LDAP Server/
Firewall Protection
Account Auto-block Protection
AES Volume and Shared Folder Encryption
Importable SSL certificate
Instant Alert via email, Desktop Notification, Beep
RSA 2048 Encryption(TOS 5.0)
PAM (Pluggable Authentication Modules)
OTP Authentication(TOS 5.0)
HyperLock File System(TOS 5.0)
Power Managerment
Power Resume
Scheduled Power On/Off
Wake up On LAN(WOL)
UPS Supported
Multi-window, Multi-task System Management
Custom Desktop
Control Panel
Resource Monitor
OS UI LanguageEnglish,German, French, Spanish, Italian, Magyar, Chinese,Japanese,Korean,Turkish, Portuguese, Russian
Application Center
iSCSI Target
Terra Photos
Duple Backup
Centralized Backup
USB Backup
VPN Server
Aria 2
Terra Search
Web Server
Clam Antivirus
Multi Media Server
Plex Media Server
Docker Manager

Full Press Release

TerraMaster, a professional brand that focuses on providing innovative storage products for homes and businesses, has a new model of 4-bay U4-423 short depth rackmount NAS with dual 2.5GbE interfaces which provides a network bandwidth up to 5 Gb via link aggregation and up to 88TB storage space. TerraMaster U4-423 adopts 1U rackmount case with a depth of only 360mm (14.17 inches) weighs merely 3.2kgs, which is applicable to most 2-column cabinets and wall-mounted small cabinets with simple installation.

TerraMaster U4-423 Key Features

Small in size and easy to deploy, occupying less space and energy

Space-saving: TerraMaster U4-423 has a shorter chassis depth and takes up less rack space than traditional NAS, which is very useful for environments with limited space, such as home basements, small offices, computer rooms, etc.;

Easy to deploy: Due to its small size and weight, TerraMaster U4-423 is easy to deploy and install in smaller racks or cabinets, and it can also be more convenient for maintenance and management, such as media production, security monitoring, etc.;

Energy saving: Compared with large NAS devices, TerraMaster U4-423 has lower power consumption, which saves more energy and operating costs.

High-speed multimedia storage and streaming media playback

Users can store multimedia files such as audio, video and pictures in TerraMaster U4-423, and use professional multimedia server software to stream these files to other devices through the 2.5GbE high-speed interface, such as smart TVs, game consoles, mobile phones, etc., to form a family multimedia center.

Support Larger Storage Space Expansion

With the latest TerraMaster TOS 5.1 system, U4-423 supports the TerraMaster USB storage  series to connect to the NAS through the USB interface, and supports the creation of arrays and storage pools to greatly expand the storage space.

For example, an external 6bay 10Gbps USB3.2 hard disk box D6-320 can provide up to 132TB of additional storage capacity of TerraMaster U4-423.

Originally posted on mightygadget.co.uk – Follow on TwitterInstagramFacebookMighty Gadget Latest Reviews

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Last update on 2024-06-17 / Affiliate links / Images from Amazon Product Advertising API

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