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Corsair EX400U

4 TB
Price in EUR including VAT
EUR172,25/1TB
21Ratings
BrandMore from Corsair
Test reports1 test
Delivered between Tue, 5.5. and Wed, 13.5.
6 pieces in stock at supplier
free shipping

Memory Size2

Product details

Blazing fast speeds offer data rates of up to 4,000 MB/s for sequential reading and up to 3,600 MB/s for sequential writing.

Compatible with USB Type-C hosts, connect via USB Type-C and Thunderbolt 4 and newer for comprehensive compatibility.

The compact design allows you to take the EX400U with you for powerful storage on the go.

The high-speed interface ensures broad compatibility and enhanced functionality.

Easy to set up with any device, ready to use instantly with a single connection for power and data to PC or Mac.

Key specifications

USB ports
USB-C
Read transfer speed
4000 MB/s
Write transfer speed
3600 MB/s

General information

Item number
53638607
Manufacturer
Corsair
Category
External SSDs
Manufacturer no.
CSSD-EX400U4TB
Release date
16.12.2024
Sales rank in Category External SSDs
23 of 577

Colour

Colour
Grey
Exact colour description
Grey

Data storage properties

Storage capacity
4 TB
USB ports
USB-C
Read transfer speed
4000 MB/s
Write transfer speed
3600 MB/s

Origin

Country of origin
China

Sustainability

Manufacturer commitment
SBTi

Voluntary climate contribution

CO₂ emissions
16,9 kg
Climate contribution
EUR 0,42

Scope of delivery

Scope of delivery
USB C-C cable

Product dimensions

Length
6.43 cm
Width
6.40 cm
Height
1.19 cm
Weight
92 g

Legal Notice

Product Safety

Package dimensions

Length
13.50 cm
Width
11 cm
Height
2.80 cm
Weight
108 g

14-day cancellation right
30-day right of return
24 Months statutory warranty
Legal concerns

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Goes with

Reviews & Ratings

Statutory warranty score

How often does a product of this brand in the «External SSDs» category have a defect within the first 24 months?

Source: Galaxus
  • 13.Synology
    1,2 %
  • 14.Crucial
    1,5 %
  • 15.Adata
    1,8 %
  • 16.Corsair
    2 %
  • 17.SanDisk Professional
    2,6 %

Statutory warranty case duration

How many working days on average does it take to process a warranty claim from when it arrives at the service centre until it’s back with the customer?

Source: Galaxus
  • 1.Corsair
    2 days
  • 1.OWC
    2 days
  • 3.Adata
    3 days
  • 3.Intenso
    3 days
  • 3.Kingston
    3 days

Return rate

How often is a product of this brand in the «External SSDs» category returned?

Source: Galaxus
  • 13.LaCie
    2,3 %
  • 13.Lexar
    2,3 %
  • 15.OWC
    4,1 %
  • 16.Corsair
    5,1 %
  • 17.SanDisk Professional
    7,3 %
Source: Galaxus

Translation: machine translated
Without ratingNo rating
notebookcheck.com Logo
notebookcheck.comSingle testReleaseNovember 2025
  • PositiveVery fast external SSD
  • Positivegood compatibility
  • Positivesmall design
  • NegativeVery hot under load
  • NegativeHigh price

The Corsair EX400U is an extremely fast external SSD with USB4 interface and even achieved the advertised 4,000 MB/s (diskspd sequential read) when tested. It also looks very good in terms of compatibility and the drive worked perfectly under macOS 26 (M4 Pro MBP14), iPad OS 26 (M4 iPad), ChromeOS (Lenovo Chromebook), iOS (iPhone 16 Pro for ProRes directly on the SSD) and Windows 11 when tested...