Corsair EX400U USB4

Overview

Corsair combines impressive USB4 speed and a phone-friendly magnetic back at a surprisingly reasonable price. For most people looking for fast, future-proof storage, this is the drive to buy right now.

– As reviewed by Tom's Hardware

TechSpot Metascore

Based on 6 expert reviews

Excellent:

2
Good:

4
Average:

0
Bad:

0

8.4

User Score

Based on 100 reviews
as rated by users

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Last revision on June 14, 2026

Reviewers Liked

High data transfer rate
Dramatic performance
Lightweight, compact dimensions
Good value
MagSafe ring for iPhone

Reviewers Didn't Like

Needs USB 4.0 for optimal performance
Only USB-C cable included
Hot under load
Lacks hardware encryption

Expert reviews and ratings

Corsair's latest portable SSD is the EX400U, a pocket-sized drive that uses a USB4 interface to deliver up to 4,000MB/s Sequential read performance. Priced at £200 here in the UK, we put this new drive through its paces and find out if it's worth buying.

By Kitguru.net on December 07, 2025

The Corsair EX400U portable SSD is a very compact and well built device that moves data at 4GB/s, that of which so few can do to date. MSRP is decent and the 3-year warranty will suffice. Recommended.

By thessdreview.com on December 07, 2025

The Corsair EX400U is the fastest portable SSD we have tested and reviewed so far, offering speeds of up to 4,000MBps via USB4 40Gbps connection.

By thepcenthusiast.com on June 23, 2025

With the EX400U, Corsair has fulfilled the desire of many media professionals for a compact and powerful external SSD.

By Macworld on April 18, 2025

By Tom's Hardware on March 20, 2025

While Corsair’s EX400U is on the slow side for a USB4 SSD, it’s also less expensive. It’s faster and more compatible across platforms than 20Gbps USB3.2×2 SSDs, as well. We’d like a higher TBW rating though.

By PCWorld on February 18, 2025

We review the Corsair EX400U 4TB to see how this USB4 portable SSD performs given its lofty performance specs

By servethehome.com on November 29, 2025

The Corsair EX400U is an extremely fast external SSD with USB4 interface. In our benchmarks it even overachieved the advertised 4,000 MB/s (diskspd sequential read). The compatibility also looks very good and the drive worked perfectly with devices running 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.

By NotebookCheck on October 26, 2025

I am extremely impressed with this Corsair EX400U 2TB USB4 External SSD. It's really small and light, and feels premium to the touch. It has small touches like that crazy magnet for mobile use, and the performance is excellent.

By christcenteredgamer.com on February 20, 2025