Corsair EX400U
Content Creation, 4K/8K Video Editing, iPhone ProRes Recording, Gaming, Data Backup, Professional Photography, Large File Transfer
Overview
The Corsair EX400U is a compact USB4 portable SSD delivering exceptional sequential read speeds up to 4,000 MB/s and write speeds up to 3,600 MB/s, making it ideal for content creators, professionals, and power users who need to transfer large 4K/8K video files, game libraries, and backups at blazing speed. Its small gunmetal chassis features an integrated MagSafe magnet on the bottom, allowing it to attach directly to iPhone for 4K ProRes video capture on the go. Powered by the Phison PS2251-21 USB4 controller with KIOXIA BiCS NAND flash, the EX400U is compatible with USB4, Thunderbolt 4, USB 3.2 Gen 2x2, and USB 3.2 Gen 2 ports, ensuring broad cross-platform support. Wirecutter named it the top portable SSD pick for 2026, praising its combination of speed, price, and features.
Key Highlights
- Blazing-fast USB4 interface with sequential read speeds up to 4,000 MB/s and write speeds up to 3,600 MB/s — rivaling early NVMe SSDs
- Compact gunmetal chassis with integrated MagSafe magnet on bottom for attaching to iPhone for direct 4K ProRes video recording
- Phison PS2251-21 USB4 controller paired with KIOXIA BiCS NAND flash for sustained high-performance transfers
- Broad compatibility with USB4, Thunderbolt 4, USB 3.2 Gen 2x2, and USB 3.2 Gen 2 ports on PC, Mac, iPad, and iPhone
- Pocket-sized and lightweight at just 92g (3.24 oz) with a short USB4 Type-C to C cable included
Video
Technical Specifications
| Brand | Corsair |
|---|---|
| Model | Corsair EX400U |
| Interface | USB4 Type-C (40Gbps) |
| Sequential Read | Up to 4,000 MB/s |
| Sequential Write | Up to 3,600 MB/s |
| Storage | 1TB / 2TB / 4TB NAND Flash (KIOXIA BiCS) |
| Connectivity | USB4 (40Gbps) / USB 3.2 Gen 2x2 (20Gbps) / Thunderbolt 4 / USB 3.2 Gen 2 (10Gbps) |
| Dimensions | Estimated ~97 x 53 x 14 mm (dimensions not officially published; weight confirmed at 92g) |