Question 1

Which is better, WD Black SN850X 2TB or Seagate Expansion 4TB?

Accepted Answer

Both products scored 8.5/10 in our testing — it's a tie. Choose based on which features matter most to you.

Question 2

Is the WD Black SN850X 2TB worth it over the Seagate Expansion 4TB?

Accepted Answer

The WD Black SN850X 2TB scores 8.5/10 while the Seagate Expansion 4TB scores 8.5/10. The WD Black SN850X 2TB is our "Best Overall" pick in the Best Portable SSDs for Streamers 2026 category.

WD Black SN850X 2TB vs Seagate Expansion 4TB: Which to Buy?