Corsair EX400U

4 TB
22Ratings
BrandMore from Corsair
Test reports1 test
Currently out of stock
Free shipping starting at 50.–

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

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

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

Package dimensions

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

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Reviews & Ratings

Warranty score

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

Source: Digitec Galaxus
  • 13.OWC
    1.3 %
  • 14.Crucial
    1.5 %
  • 15.Adata
    1.8 %
  • 16.Corsair
    2 %
  • 17.SanDisk Professional
    2.4 %

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: Digitec Galaxus
  • Corsair
    Not enough data
  • 1.Adata
    2 days
  • 1.Intenso
    2 days
  • 1.OWC
    2 days
  • 4.Crucial
    3 days

Return rate

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

Source: Digitec Galaxus
  • 13.Lexar
    2.4 %
  • 14.LaCie
    2.6 %
  • 15.OWC
    4 %
  • 16.Corsair
    5 %
  • 17.SanDisk Professional
    6 %
Source: Digitec 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...