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External SSDs

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LaCie Rugged SSD Pro 4TB vs Lexar SL660 1TB — Which External SSD Is Faster & Better Value?

Compare LaCie Rugged SSD Pro 4TB and Lexar SL660 1TB side by side. Both are 4TB Thunderbolt 3 external SSDs, but they differ in speed, design, and value. Here's how they stack up.

Our Pick

LaCie

LaCie Rugged SSD Pro 4TB
9.2/10

A 4TBThunderbolt 3 portable — uniquely huge for this speed tier. The Rugged SSD Pro 4TB fills a slot nothing else really does: 4TB of fast external storage that's actually rugged, not just claimed to be.

Thunderbolt 3 + 4TB
IP67 + 3m drop + 1-ton crush
5-year Rescue
Check on Amazon →

Lexar

Lexar SL660 1TB
8.1/10

A premium 2000 MB/s Gen 2x2 portable with an aluminum body and an RGB-lit Logo. The RGB is a divisive feature but the performance is real, and the build quality distinguishes it from cheaper Gen 2x2 peers like the Patriot Evlvr.

Gen 2x2 2000/2000 MB/s
Aluminum body
3-year warranty
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Spec Comparison

Spec
LaCie Rugged SSD Pro 4TB
Lexar SL660 1TB
Read Speed
2.7 GB/s ✓
2.0 GB/s
Write Speed
1.9 GB/s
2.0 GB/s ✓
Capacity
4 TB ✓
1 TB
Interface
Thunderbolt 3
USB 3.2 Gen 2x2
Endurance (TBW)
2,400 TB ✓
600 TB
Warranty
5 Years ✓
3 Years
Score
9.2/10 ✓
8.1/10
Total Wins
5 wins
1 win

Frequently Asked Questions

Which is better, LaCie Rugged SSD Pro 4TB or Lexar SL660 1TB?
The LaCie Rugged SSD Pro 4TB scores 9.2/10 compared to 8.1/10 for the Lexar SL660 1TB. Our expert analysis favors the LaCie Rugged SSD Pro 4TB for its superior speed.
What's the difference between LaCie Rugged SSD Pro 4TB and Lexar SL660 1TB?
The key differences: The LaCie Rugged SSD Pro 4TB offers 2,700 MB/s reads vs 2,000 MB/s for the Lexar SL660 1TB. Capacity options differ: LaCie Rugged SSD Pro 4TB is 4TB while Lexar SL660 1TB is 1TB. The LaCie Rugged SSD Pro 4TB uses Thunderbolt 3 while the Lexar SL660 1TB uses USB 3.2 Gen 2x2.
Which is faster, LaCie Rugged SSD Pro 4TB or Lexar SL660 1TB?
The LaCie Rugged SSD Pro 4TB is faster with 2,700 MB/s read speeds compared to 2,000 MB/s for the Lexar SL660 1TB. That's a 35% speed advantage.
Which has better value, LaCie Rugged SSD Pro 4TB or Lexar SL660 1TB?
The LaCie Rugged SSD Pro 4TB scores higher (9.2 vs 8.1/10), indicating better overall value in our evaluation. Check both models on the retailer's site for the latest details.

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