Crucial X9 Pro 4TB
Score: 93/100
SanDisk Extreme PRO 4TB USB4
Score: 92/100Rankings
The Crucial X9 Pro 4TB Portable SSD delivers top-tier USB-C Gen 2 performance in a tiny, rugged package with hardware encryption and a long warranty, ideal for creators on the move.
The 4 TB SanDisk Extreme PRO Portable SSD uses USB4 to deliver near-internal SSD performance with up to 3800 MB/s reads, while offering rugged IP65 protection and hardware encryption. It shines on Thunderbolt-4 hosts but can fall back to slower speeds on older machines, and its larger size makes it less pocket-friendly.
| Attribute | | |
|---|---|---|
4,000 GBbest | 4,000 GBbest | |
1,050 MB/s | 3,800 MB/sbest | |
1,050 MB/s | 3,700 MB/sbest | |
| ↓ lower better | 38 gbest | 172 g |
60 monthsbest | 60 monthsbest |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | | |
|---|---|---|
Performance(3) | ||
Interface | USB-C 3.2 Gen 2 | USB4 |
Sequential Read Speed (MB/s) | 1050 MB/s | 3800 MB/s |
Sequential Write Speed (MB/s) | 1050 MB/s | 3700 MB/s |
Build & Design(3) | ||
Weight (g) | 38 g | 172 g |
Form Factor | Portable | 2280 |
IP Rating | IP55 | IP65 |
Power & Connectivity(1) | ||
Power Source | Bus-powered | bus-powered |
Compatibility(1) | ||
Operating System Compatibility | Windows, macOS, Linux, Android, iPad, Xbox, PlayStation | Windows 10+, macOS 14+ |
Products in the top-left offer the best value (high score, low price).
Professional reviewers rate the X9 Pro highly (4.5/5), praising its speed, durability, and encryption while noting it falls short of the X10 Pro's ultimate speeds.
Everyday users love its pocket-size, fast transfers, and rugged build, though they complain about the short cable and occasional speed variance.
“perfect for travel”
“easy to carry on a keychain”
“lack of a USB-A adapter is a frequent frustration”
Professional reviewers commend the Extreme PRO USB4 SSD for its blazing peak speeds and rugged build, but repeatedly warn that real-world performance hinges on a fully compatible 40 Gbps host. PCWorld and The SSD Review note that without BIOS or firmware updates the drive often falls back to slower USB 3.x rates, and some USB4 implementations cap at 32 Gbps, keeping it slightly behind rivals like the Samsung X5. Nonetheless, on Thunderbolt-4 Macs the drive consistently hits its advertised 3800 MB/s reads.
Everyday users, especially video editors and photographers, praise the drive's speed, plug-and-play ease, and durable design for on-location work. The average rating hovers around 4.5 / 5, though recurring complaints focus on initial connection hiccups, the larger form factor, and occasional speed throttling after the cache is exhausted.
