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Portable SSDs

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SanDisk Extreme Pro Portable 4TB vs SSK PM510 USB4 Portable 1TB — Which Portable SSD Is Faster & Better Value?

Compare SanDisk Extreme Pro 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.

Our Pick

SanDisk

SanDisk Extreme Pro Portable 4TB
9.3/10

The 4TB Extreme Pro is the largest portable SSD in SanDisk's ruggedized line and a direct competitor to the Samsung T7 Shield 4TB. The 5-year warranty plus IP55 rubber armor are distinguishing factors vs other 4TB portable SSDs — most peers only offer 3.

4TB @ IP55 rugged
5-year warranty
Both cables in box
Check on Amazon →

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
Check on Amazon →

Spec Comparison

Spec
SanDisk Extreme Pro Portable 4TB
SSK PM510 USB4 Portable 1TB
Read Speed
1.1 GB/s
3.2 GB/s ✓
Write Speed
1.0 GB/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
5 Years ✓
3 Years
Score
9.3/10 ✓
8.6/10
Total Wins
4 wins
2 wins

Frequently Asked Questions

Which is better, SanDisk Extreme Pro Portable 4TB or SSK PM510 USB4 Portable 1TB?
The SanDisk Extreme Pro Portable 4TB scores 9.3/10 compared to 8.6/10 for the SSK PM510 USB4 Portable 1TB. Our expert analysis favors the SanDisk Extreme Pro Portable 4TB for its superior value.
What's the difference between SanDisk Extreme Pro Portable 4TB and SSK PM510 USB4 Portable 1TB?
The key differences: The SanDisk Extreme Pro Portable 4TB offers 1,050 MB/s reads vs 3,200 MB/s for the SSK PM510 USB4 Portable 1TB. Capacity options differ: SanDisk Extreme Pro Portable 4TB is 4TB while SSK PM510 USB4 Portable 1TB is 1TB. The SanDisk Extreme Pro Portable 4TB uses USB 3.2 Gen 2 while the SSK PM510 USB4 Portable 1TB uses USB4.
Which is faster, SanDisk Extreme Pro 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 1,050 MB/s for the SanDisk Extreme Pro Portable 4TB. That's a 205% speed advantage.
Which has better value, SanDisk Extreme Pro Portable 4TB or SSK PM510 USB4 Portable 1TB?
The SanDisk Extreme Pro Portable 4TB scores higher (9.3 vs 8.6/10), indicating better overall value in our evaluation. Check both models on the retailer's site for the latest details.

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