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Portable SSDs

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Crucial X6 Portable 4TB vs SSK PM510 USB4 Portable 1TB

Compare Crucial X6 Portable 4TB and SSK PM510 USB4 Portable 1TB side by side. Both are 4TB USB 3.2 Gen 2 external SSDs, but they differ in speed, design, and value. Here's how they stack up.

Crucial

Crucial X6 Portable 4TB
8.0/10

A 4TB portable at the X6's budget price is closer to spinning-rust economics than SSD. The 800 MB/s ceiling doesn't matter for the use case — the entire point is capacious portable cold library overflow for PS5, Xbox, or photo archive, not peak throughput.

4TB at budget pricing
PS5/Xbox cold-library friendly
Cool operation
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Our Pick

SSK

SSK PM510 USB4 Portable 1TB
8.6/10

A USB4 portable at enthusiast-grade specs -- 3200 MB/s read over USB4 / Thunderbolt 4 hosts. The PM510 is one of the more affordable USB4 portables, an entry point for video editors who need Thunderbolt-class speeds but do not want to pay LaCie or OWC premium.

USB4 3200 MB/s
Thunderbolt 4 compatible
Aluminum body
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Spec Comparison

Spec
Crucial X6 Portable 4TB
SSK PM510 USB4 Portable 1TB
Read Speed
800 MB/s
3.2 GB/s ✓
Write Speed
800 MB/s
2.8 GB/s ✓
Capacity
4 TB ✓
1 TB
Interface
USB 3.2 Gen 2
USB4
Endurance (TBW)
2,400 TB ✓
600 TB
Warranty
3 Years
3 Years
Score
8.0/10
8.6/10 ✓
Total Wins
2 wins
3 wins

Frequently Asked Questions

Which is better, Crucial X6 Portable 4TB or SSK PM510 USB4 Portable 1TB?
The SSK PM510 USB4 Portable 1TB scores 8.6/10 compared to 8.0/10 for the Crucial X6 Portable 4TB. Our expert analysis favors the SSK PM510 USB4 Portable 1TB for its superior speed.
What's the difference between Crucial X6 Portable 4TB and SSK PM510 USB4 Portable 1TB?
The key differences: The Crucial X6 Portable 4TB offers 800 MB/s reads vs 3,200 MB/s for the SSK PM510 USB4 Portable 1TB. Capacity options differ: Crucial X6 Portable 4TB is 4TB while SSK PM510 USB4 Portable 1TB is 1TB. The Crucial X6 Portable 4TB uses USB 3.2 Gen 2 while the SSK PM510 USB4 Portable 1TB uses USB4.
Which is faster, Crucial X6 Portable 4TB or SSK PM510 USB4 Portable 1TB?
The SSK PM510 USB4 Portable 1TB is faster with 3,200 MB/s read speeds compared to 800 MB/s for the Crucial X6 Portable 4TB. That's a 300% speed advantage.
Which has better value, Crucial X6 Portable 4TB or SSK PM510 USB4 Portable 1TB?
The SSK PM510 USB4 Portable 1TB scores higher (8.6 vs 8.0/10), indicating better overall value in our evaluation. Check both models on the retailer's site for the latest details.

More Comparisons

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Crucial X6 Portable 4TB vs Crucial X10 Pro Portable 4TB → SSK PM510 USB4 Portable 1TB vs Crucial X10 Pro Portable 4TB →
Crucial X6 Portable 4TB vs Sabrent Rocket Nano V2 → SSK PM510 USB4 Portable 1TB vs Sabrent Rocket Nano V2 →