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Corsair EX400U 2TB Portable SSD Review

Simon Crisp February 14, 2025 Featured Tech Reviews, Reviews, SSD Drives

Rating: 8.5.

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.

Corsair's new EX400U is available in three capacities; 1TB, 2TB (the drive we are reviewing) and a flagship 4TB model. All three have the same Sequential read/write official ratings; up to 4,000MB/s and up to 3,600MB/s respectively.

The EX400U uses one of Phison latest PS2251-21 (U21) controllers. The PS2251-21 is the world's first native USB4 controller delivering Sequential read and write speeds of up to 4GB/s. Being native means there is no need for a bridging chip taking up space, resulting in more compact drives. We couldn't find any information about what NAND is being used in the drive.

Corsair back the EX400U series with a three-year warranty.

Physical Specifications:

  • Usable Capacities: 2TB.
  • NAND Components: n/s.
  • NAND Controller: Phison PS2251-21.
  • Interface:  USB-C.
  • Form Factor: External.
  • Dimensions: 64.3 x 64 x 12mm,
  • Drive Weight: 383g.

Firmware Version: ULFM90.1

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