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External SSDs

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

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

SanDisk

SanDisk Extreme Portable 1TB
8.5/10

The non-Pro Extreme is the lower-cost sibling — same 1050 MB/s rated read and IP55 rugged body, but writes top out well below Extreme Pro on sustained workloads. A solid buy when the write-speed gap doesn't matter (game consoles, file transfer, backup) but the rugged rating does.

IP55 rugged body
Same 1050 read as Extreme Pro
Cheaper than Pro by a wide margin
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Our Pick

SSK

SSK PM510 USB4 1TB
8.6/10

AUSB4 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 don't want to pay LaCie or OWC premium.

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

Spec
SanDisk Extreme Portable 1TB
SSK PM510 USB4 1TB
Read Speed
1.1 GB/s
3.2 GB/s ✓
Write Speed
1.0 GB/s
2.8 GB/s ✓
Capacity
1 TB
1 TB
Interface
USB 3.2 Gen 2
USB4
Endurance (TBW)
600 TB
600 TB
Warranty
3 Years
3 Years
Score
8.5/10
8.6/10 ✓
Total Wins
0 wins
3 wins

Frequently Asked Questions

Which is better, SanDisk Extreme Portable 1TB or SSK PM510 USB4 1TB?
The SSK PM510 USB4 1TB scores 8.6/10 compared to 8.5/10 for the SanDisk Extreme Portable 1TB. Our expert analysis favors the SSK PM510 USB4 1TB for its superior speed.
What's the difference between SanDisk Extreme Portable 1TB and SSK PM510 USB4 1TB?
The key differences: The SanDisk Extreme Portable 1TB offers 1,050 MB/s reads vs 3,200 MB/s for the SSK PM510 USB4 1TB. Capacity options differ: SanDisk Extreme Portable 1TB is 1TB while SSK PM510 USB4 1TB is 1TB. The SanDisk Extreme Portable 1TB uses USB 3.2 Gen 2 while the SSK PM510 USB4 1TB uses USB4.
Which is faster, SanDisk Extreme Portable 1TB or SSK PM510 USB4 1TB?
The SSK PM510 USB4 1TB is faster with 3,200 MB/s read speeds compared to 1,050 MB/s for the SanDisk Extreme Portable 1TB. That's a 205% speed advantage.
Which has better value, SanDisk Extreme Portable 1TB or SSK PM510 USB4 1TB?
The SSK PM510 USB4 1TB scores higher (8.6 vs 8.5/10), indicating better overall value in our evaluation. Check both models on the retailer's site for the latest details.

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