Skip to main content
External SSDs

As an Amazon Associate I earn from qualifying purchases. We may earn a commission from qualifying purchases made through links on this page. Prices and availability are subject to change. We are reader-supported and independent — our rankings are based on an objective scoring rubric, not sponsorship.

LaCie Rugged SSD Pro 4TB vs Lexar SL660 2TB — Which External SSD Is Faster & Better Value?

Compare LaCie Rugged SSD Pro 4TB and Lexar SL660 2TB 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 2TB
8.2/10

The 2TB SL660 doubles SLC cache budget over the 1TB. RGB and aluminum body preserved — a competitive Gen 2x2 2TB at moderate pricing. Worth comparing with the Kingston XS2000 2TB and Patriot Evlvr 2TB.

Gen 2x2 2000 MB/s
2TB storage
Aluminum body
Check on Amazon →

Spec Comparison

Spec
LaCie Rugged SSD Pro 4TB
Lexar SL660 2TB
Read Speed
2.7 GB/s ✓
2.0 GB/s
Write Speed
1.9 GB/s
2.0 GB/s ✓
Capacity
4 TB ✓
2 TB
Interface
Thunderbolt 3
USB 3.2 Gen 2x2
Endurance (TBW)
2,400 TB ✓
1,200 TB
Warranty
5 Years ✓
3 Years
Score
9.2/10 ✓
8.2/10
Total Wins
5 wins
1 win

Frequently Asked Questions

Which is better, LaCie Rugged SSD Pro 4TB or Lexar SL660 2TB?
The LaCie Rugged SSD Pro 4TB scores 9.2/10 compared to 8.2/10 for the Lexar SL660 2TB. 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 2TB?
The key differences: The LaCie Rugged SSD Pro 4TB offers 2,700 MB/s reads vs 2,000 MB/s for the Lexar SL660 2TB. Capacity options differ: LaCie Rugged SSD Pro 4TB is 4TB while Lexar SL660 2TB is 2TB. The LaCie Rugged SSD Pro 4TB uses Thunderbolt 3 while the Lexar SL660 2TB uses USB 3.2 Gen 2x2.
Which is faster, LaCie Rugged SSD Pro 4TB or Lexar SL660 2TB?
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 2TB. That's a 35% speed advantage.
Which has better value, LaCie Rugged SSD Pro 4TB or Lexar SL660 2TB?
The LaCie Rugged SSD Pro 4TB scores higher (9.2 vs 8.2/10), indicating better overall value in our evaluation. Check both models on the retailer's site for the latest details.

More Comparisons

LaCie Rugged SSD Pro 4TB vs Samsung T9 2TB → Lexar SL660 2TB vs Samsung T9 2TB →
LaCie Rugged SSD Pro 4TB vs Samsung T9 Portable SSD → Lexar SL660 2TB vs Samsung T9 Portable SSD →
LaCie Rugged SSD Pro 4TB vs Crucial X10 Pro 2TB → Lexar SL660 2TB vs Crucial X10 Pro 2TB →
LaCie Rugged SSD Pro 4TB vs Samsung T7 4TB → Lexar SL660 2TB vs Samsung T7 4TB →