Seagate Expansion 4 TB: price per TB and price history
Part number STNN4000400ASIN B0GS72N75NBrand SeagateExternal 2.5"
The Seagate Expansion 4 TB (STNN4000400) is an external 2.5-inch hard drive by Seagate. On amazon.com it costs $189.99 new, which is $47.50 per TB (as of Oct 28, 2026, 1:02 AM UTC). That is the lowest price per TB of the last 90 days.
Price per TB, New
Total $189.99 for 4 TB, cheapest new offer, excl. shipping
- 1 day
- 0.0 %
- 7 days
- 0.0 %
- 30 days
- n/a
- 90-day low
- 47.50
90 days
How much does the Seagate Expansion 4 TB cost per TB?
The Seagate Expansion 4 TB costs $47.50 per TB new on amazon.com. That matches the TB index for external 2.5-inch hard drives ($47.50 per TB). Among 66 new external 2.5-inch hard drives it ranks number 6 by price per TB.
| Condition | Price | Price per TB | As of | Offer |
|---|---|---|---|---|
| New | $189.99Oct 28, 2026, 1:02 AM UTC | $47.50 | Oct 28, 2026, 1:02 AM UTC | Amazon* |
Prices: cheapest offer per condition from all sellers on amazon.com (Amazon and marketplace sellers), excluding shipping, timestamp per row. At the top of its product page, Amazon often shows the featured offer from another seller, which can cost more. The button therefore opens the list of all offers. The price may have changed since the timestamp. If the Amazon app opens in another country's store, prices there differ: set the app to United States or open the link in your browser.
How has the price of the Seagate Expansion 4 TB changed?
The 90-day low is $47.50 per TB ($189.99). It counts the lowest price that held for at least 2 days.
| Period | Change in price per TB |
|---|---|
| 7 days | 0.0 % |
| 14 days | ▼ 6.2 % |
| 30 days | n/a |
| 90 days | n/a |
Price archive since Aug 22, 2026, updated daily.
What are the specs of the Seagate Expansion 4 TB?
According to the listing, the Seagate Expansion 4 TB has 4 TB of capacity, form factor 2.5" external.
| Spec | Value |
|---|---|
| Brand | Seagate |
| Part number | STNN4000400 |
| ASIN | B0GS72N75N |
| Capacity | 4 TB (4 × 10¹² Byte) |
| Form factor | 2.5" external |
| Technology | HDD |
What are the alternatives to the Seagate Expansion 4 TB?
At 4 TB, the WD Elements 4 TB (WDBU6Y0040BBK-WESN) costs $45.97 per TB.
| Product | Capacity | Price per TB |
|---|---|---|
| WD Elements 4 TB | 4 TB | $45.97 |
Frequently asked questions about the Seagate Expansion 4 TB
Is the Seagate Expansion 4 TB cheap right now?
The price per TB is at its 90-day low of $47.50 per TB and level with the TB index for its product type (as of Oct 28, 2026, 1:02 AM UTC).
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Prices: amazon.com, timestamp per row. Specs: manufacturer data sheet. Calculation: How the TB index works. All offers External 2.5".