Corsair
Corsair EX400U
S
Ranked #1 in External SSDs
Backed by 4 cited sources
Covered by 4 outlets
The 2026 consensus flagship: real-world USB4 speeds around 4,000/3,600 MB/s at prices close to older 20Gbps drives, making those hard to justify. Compact, magnetic (MagSafe-friendly) and broadly compatible across PCs, Macs and phones.
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Key features
- ✓ USB4 40Gbps, up to 4,000 MB/s read
- ✓ MagSafe-style magnetic attachment
- ✓ 1TB/2TB/4TB capacities
- ✓ Compact 2.5-inch square design
- ✓ 3-year warranty
The sources behind this ranking
4 cited sources cover Corsair EX400U. Here's the stance each one takes.
S 1 A 3
T 
Tom's Hardware Calls it game-changing USB4 speed in a magnetic, phone-friendly form factor; says it makes 20Gbps drives at the same price hard to argue for. S Read → P 
PCWorld Compact, fast, and affordable; great price-to-performance with a still-unique magnetic attachment ring. A Read → M 
Macworld Not the fastest 40Gbps SSD but very affordable, light, compact and far more compatible across PCs and Macs than 20Gbps USB 3.2x2 drives. A Read → E 
Engadget Named best high-speed option in its May 2026 best portable SSDs guide - roughly double the sequential speeds of standard drives for pros with large media files. A Read →