Corsair

Corsair EX400U

Ranked #4 in External SSDs

813 LP on the category ladder what's LP?

Announced January 2025 by Corsair

Wirecutter's tested top pick for durability and speed, and the fastest mainstream-recommended drive here. Sustained-load heat, flagged by Notebookcheck, is the one long-term question mark that keeps it off the top spot.

Consolidated from 26 cited sources across 25 outlets

Where the cited sources landed, as we read them

1 enthusiastic source
19 positive sources
5 mixed sources
1 unconvinced source

See the sources

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Pros & cons

✓ Wirecutter's top pick after testing 24 portable SSDs, for the best mix of affordability, speed, and durability
✓ Delivers on its USB4 performance promises per ServeTheHome
✓ Speedy and highly portable, and works as a phone companion
✓ Measured USB4 speeds of up to 4GB/s read and 3.6GB/s write, faster than many early NVMe SSDs
✓ Wirecutter says larger-capacity drives like it are worth the investment for regularly storing large files

✗ Runs hot under sustained loads
✗ High heat development
✗ Premium position

The sources behind this ranking

We searched the web and YouTube for what has been published about this product, then read the articles, video transcripts and comments we found.

Evidence 11 articles, 13 video reviews and 2 community sources

1 enthusiastic source

Macworld Macworld · reviewer · Jul 2022

The EX400U from Corsair is a compact and powerful external USB4 SSD.

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19 positive sources

Tom's Hardware Article · Feb 2024

In the USB4 realm, which is much more widespread than faster Thunderbolt 5, Corsair’s EX400U strikes a great balance between performance and price. Our sequential testing shows it's capable of read speeds above 4,000 MBps, and read speeds over 3,700 MBps. And our sustained Iometer testing showed the drive maintaing a write speed typically between 1,600 and 1,700 MBps for 15 minutes.

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Boss LA Boss LA · 116K subscribers · Jan 2026

I think this is the best external SSD on this price range out there.

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Basic Tutorials Article · Oct 2025

The CORSAIR EX400U SURVIVOR has everything that characterizes a high-performance mobile SSD: Thanks to USB4 technology, it achieves read speeds of up to 4,000 MB/s and write speeds of up to 3,600 MB/s. This makes it ideal for large video or data transfers in professional working environments.

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ValorGears ValorGears · 110K subscribers · May 2025

Both tests yielded speeds close to 40Gbps, approximately 4000MB/s. Write speeds were slower, but surprisingly, they reached 30Gbps, or about 3000MB/s. As a device that can be attached to an iPhone and used as an external SSD, it's lightweight, weighing less than 100g.

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TechPowerUp Article · Oct 2025

Corsair today announced two new portable SSDs: the EX400U SURVIVOR USB4 External SSD, delivering outstanding transfer speeds in a rugged, travel‑ready design, and the EX300U USB External SSD, featuring a MagSafe‑compatible magnetic ring for effortless on‑the‑go data storage.

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Xguide Xguide · 7.3K subscribers · Jan 2026

So, is the Corsair EX400U legit? Yes, it delivers on its peak speed claims and benchmarks while realworld usage reflects typical USB4 behavior. If you understand that difference, it performs exactly as expected.

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ZDNET Taylor Clemons · reviewer · May 2026

The Corsair EX400U is an excellent, compact and portable external SSD for gamers, creative professionals, and mobile users. With 2TB of space, you'll have plenty of storage for large program downloads, raw video files, photos, and more.

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Reviewsinside Reviewsinside · 4.6K subscribers · Sept 2025

The Corsair EX400U 2 TBTE USB 4 portable external SSD is a powerhouse in a compact form. Offering lightning fast speeds and a versatile plug-and-play experience, this device brings high performance storage to your fingertips. Whether you're working with large video files, high resolution photos, or data heavy applications, this drive promises to cut down weight times and boost productivity.

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PCMag UK Article · Jan 2026

The EX400U has a simple, dense design: a square chassis with rounded corners, finished in matte silver-gray, measuring 0.5 by 2.5 by 2.5 inches (HWD) and weighing just 3.2 ounces. The Corsair logo adorns the top of the drive.

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USP REVIEW USP REVIEW · 2K subscribers · Apr 2025

Overall, the Corsair EX 400U strikes a smart balance between price, performance, and portability. If you're looking for an affordable USB 4 SSD that performs well for everyday use, this is easily one of the best options currently available. Check out the video description for updated price.

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Wirecutter Article Read S

Shadi how to's Shadi how to's · 1.5K subscribers · Jan 2026

Overall, the Corsair EX400U is a real high-speed drive that performs exactly as a USB 4 SSD should. The key is understanding that peak speeds appear in benchmarks while daily usage reflects more realistic conditions.

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Overclock3d Article

Corsair’s pushing 4,000 MB/s speeds with its portable EX400U SURVIVOR USB4 SSD

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Consumesense Consumesense · 1.3K subscribers · Apr 2025

The Corsair EX400U USB4 portable SSD delivers nextG speed and seamless convenience. With USB4 technology, you get transfer speeds up to 3,700 megabytes per second. Perfect for moving large files, editing high-res video, or launching applications directly from the drive. And with the options of 1 TB, 2 TB, or 4 TB of ultraast storage, there's room for everything you need on the go.

Watch I Instagram Instagram post

Exclusively sold at @corsair, this little SSD pack a punch in a small size.

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Product Scout Product Scout · 562 subscribers · Aug 2025

With a bandwidth of up to 40 Gbits per second, this SSD promises blazing fast data transfer speeds. To put that into perspective, it offers sequential read speeds of up to 4,000 megabytes per second and sequential write speeds reaching 3,500 megabytes per second.

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PCMag Article Read G

Gadget Quest Pro Gadget Quest Pro · 175 subscribers · Aug 2025

The Corsair EX 400U is a top tier portable SSD that delivers on its promises. The combination of USB 4 connectivity, lightning fast speeds, and a compact design makes it an excellent choice for anyone who needs high performance storage on the go.

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ServeTheHome Article Read

5 mixed sources

C Cameron Mahaffey Facebook post

The CORSAIR EX400U 4TB does not work on Macs (well at least the MacBook M4 Pro 128 unified), however, the Corsair EX400U 2TB does work perfectly.

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Reviewsinside Reviewsinside · 4.6K subscribers · Sept 2025

While the Corsair EX400U delivers fantastic performance, it does come with some limitations. For instance, the drive's maximum performance requires a USB 4 connection. And on systems that only have USB type-C or Thunderbolt 3, you'll see a decrease in speed. That said, the drive still performs well in these cases, but if you're looking for those blistering speeds, you'll need the latest tech.

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Notebookcheck Article Read T

The Consumer's Friend The Consumer's Friend · 1.8K subscribers · Dec 2025

That said, after about 10 minutes of meteous riding, the metal top started the warm up. Not scalding, but noticeably warm to the touch, hitting around 39° C. It is not a dealbreaker, but something you feel if you're holding it during a long export.

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Epress Verify Epress Verify · 1K subscribers · Jan 2026

The EX400U also runs warm under sustained load, which can affect long transfers. There's no rugged casing or extra protection. So, this drive is clearly designed for speed rather than durability. So, is it a scam? No. The Corsair EX400U is a legitimate high-performance USB 4 SSD. It reaches its advertised speeds and benchmarks and still delivers excellent realworld performance.

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1 unconvinced source

Critical Reviews Critical Reviews · 13.4K subscribers · Jan 2026

Reason number six, it's a bit pricey.

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Frequently asked questions

It ranks #4 of 28 on our external SSDs tier list, in A tier. That placement draws on 26 cited sources across 25 outlets.

1 of the 26 sources with a clear view is critical of it: Critical Reviews. Runs hot under sustained loads. High heat development. Premium position.

On our external ssds board, Samsung T9 ranks #1 (S tier) ahead of Corsair EX400U at #4 (A tier). Samsung T9: Ranked here on pure ownership merit, because the hardware and warranty are genuinely excellent. It is still a trap because you pay the Samsung tax for what the Crucial X10 delivers. Buy the X10 or the T7 Shield.

The Corsair EX400U is for people who need a lot of space, up to 4 TB, without paying flagship money. The research found proven endurance in RTINGS tests, NVMe-class USB 3.2 speed and a 3-year warranty, and recorded no cons. If speed matters more than capacity, the Samsung T9 at the top of our board is the faster drive. Do not be tempted by the cheaper high-capacity Samsung T5 EVO, which is in F tier for its slow QLC design.

The research cited proven endurance in RTINGS tests and a 3-year warranty, and found nothing to count against it. That is why it ranks fourth on our board. As with any SSD, keep a second copy of anything you cannot replace.

Yes. Its NVMe-class speed over USB 3.2 loads PC game libraries quickly, and 4 TB holds a large library. On a PS5 or Xbox it can store games and play last-generation titles directly. Current-generation console games must be moved back to internal storage to run, which is true of every external drive.

No. It works on any USB-C port and on USB-A with an adapter. It reaches its highest speed on a USB4 or Thunderbolt port and runs at the port's speed on slower connections. Plug it into the fastest port your computer has.

Use exFAT if it moves between a Windows PC, a Mac and a console, because all of them read and write it. Use NTFS on Windows only or APFS on Mac only for better handling of very large files and permissions. Formatting erases the drive, so copy files off first.