This article covers CORSAIR EX400U SURVIVOR 2TB USB4 外付けSSD.

Overview

CORSAIR's EX400U SURVIVOR 2TB is a USB4 external SSD that pushes portable storage into a new tier of speed and durability. With sequential reads up to 4,000MB/s and writes up to 3,600MB/s, it can handle large video files, game libraries, and creative workloads nearly as fast as an internal NVMe drive.
The drive is housed in an IP55-rated rugged chassis, meaning it resists dust ingress and water jets from any direction. That level of protection is rare in high-speed portable SSDs, making this a compelling option for fieldwork, outdoor shoots, or any situation where gear takes a beating.
In the market, the EX400U SURVIVOR sits at the high-end tier of portable SSDs—it combines cutting-edge USB4 bandwidth with genuine ruggedness. There are faster portable SSDs (those hitting 5,000MB/s) and there are tougher ones (IP68-rated), but very few bridge both worlds as effectively.

Compatibility Guide

  • Host interface: USB4 / Thunderbolt 4 provides full 40Gbps bandwidth. Plugging into a USB 3.2 Gen 2x2 (20Gbps) or lower port will limit speed proportionally.
  • Platforms: Windows, macOS, iPadOS 13+, and select Android devices with USB-C. No driver installation required—exFAT formatted out of the box.
  • Power: Bus-powered via a single USB-C cable. No external power adapter needed, but some older USB-A ports may not supply enough current.
  • Physical fit: Compact form factor (approx. 110×60×14mm) and light weight (~100g) make it pocketable.

Product Info

  • Model: CSSD-EX400US2TB
  • Capacity: 2TB (no 1TB variant available)
  • Interface: USB4 (Type-C) / Thunderbolt 4, backward compatible with USB 3.2 Gen 2x2 and earlier
  • Sequential read: 4,000MB/s (max)
  • Sequential write: 3,600MB/s (max)
  • Durability: IP55 (dust-protected and protected against water jets)
  • Warranty: 3 years (Corsair official)

Market positioning

The EX400U SURVIVOR is positioned as a high-end portable SSD that bridges the gap between raw speed and physical toughness. Its direct competitors include the Samsung T9 (similar speed, no IP rating) and the LaCie Rugged series (IP67 but limited to 1,050MB/s). The CORSAIR drive is one of the few that delivers both 4,000MB/s throughput and IP55 protection in a single package.

Best Use Cases

  • Video editors and content creators: Offload 4K/8K RAW footage directly from cameras to the SSD in the field. The USB4 speed makes proxy-free editing possible when connected to a compatible laptop.
  • Field technicians and outdoor professionals: IP55 certification means the drive can handle rain, dust, and accidental splashes. Useful for drone pilots, surveyors, or anyone who needs reliable storage in harsh conditions.
  • PC gamers on the go: Install modern AAA titles on this SSD and play directly via USB4—load times will be close to internal NVMe performance. However, some titles with aggressive loading patterns may still show slightly longer waits compared to an internal Gen4 drive.
  • Who should NOT buy it: Users who only have USB-A ports (3.0/3.1) on their machines will see speeds under 500MB/s, negating the value. If you need full waterproofing (submersion), look for an IP68-rated drive instead.

Things to Consider

  • Host dependency: The advertised 4,000MB/s read speed is only achievable with USB4 or Thunderbolt 4. Testing with an older USB 3.2 Gen 2 (10Gbps) port yields around 1,000MB/s—still fast, but far from the headline number.
  • IP55 ≠ waterproof: The drive can survive rain and splashes but cannot be submerged. If you need a drive for snorkeling trips or heavy rain fieldwork, an IP68 model is safer.
  • Single capacity: Only 2TB is offered. Those needing 1TB will have to look elsewhere, and 4TB users will be disappointed.
  • Thermal throttling: Under sustained heavy writes, a small external drive can heat up. The aluminum chassis helps dissipate heat, but in hot ambient conditions, expect some speed reduction after extended transfers.

FAQ

Q: Can I use this SSD with a PlayStation or Xbox?
A: PlayStation 5 supports USB external drives only for PS4 games—PS5 games require the internal SSD slot. Xbox Series X/S supports external drives for backward-compatible titles. Performance will be limited by the USB 3.x interface on consoles (≈1,000MB/s).
Q: Is TRIM supported over USB4?
A: Yes, when connected via USB4 or Thunderbolt 4 on Windows 11 and macOS Ventura+, TRIM commands are passed through, helping maintain performance over the drive's lifespan.
Q: How does it compare to the Samsung T9?
A: The T9 offers similar sequential speeds (2,000MB/s read/write) via USB 3.2 Gen 2x2 but lacks any IP rating. The EX400U SURVIVOR is faster and tougher, though the T9 often retails for slightly less. For pure data transfer speed, the CORSAIR wins; for dust/water resistance, it's the clear choice.

Product Disclosure (Amazon)

  • Manufacturer: CORSAIR
  • Seller: Amazon.co.jp
  • Fulfilled by: Amazon.co.jp
  • ASIN: B0FVMLZJ1D
  • Note: This article covers a manufacturer-made product based on Amazon listing details.