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Seagate Expansion Portable, 4TB, External Hard Drive, 2.5 Inch, USB 3.0… competes with other External Storage products on SpecPicks. Use our Compare tool to view specs side-by-side, or browse the full External Storage category for alternatives.

Seagate

Seagate Expansion Portable, 4TB, External Hard Drive, 2.5 Inch, USB 3.0, for Mac and PC (STKM4000400)

Name: Seagate Expansion Portable, 4TB, External Hard Drive, 2.5 Inch, USB 3.0, for Mac and PC (STKM4000400)
Brand: Seagate
SKU: B08ZJFH7Y1
Price: 189.99 USD
Availability: InStock

By Mike Perry, Hardware Editor · Verified 2026-09-06

Mike Perry has researched PC hardware since 2014, tracking 80+ GPU generations, 50+ retro handheld platforms, and 30+ vintage PC configurations. He synthesises community benchmarks, manufacturer specs, and public forum data into actionable buying guides. View full credentials →

$189.99

As an Amazon Associate, SpecPicks earns from qualifying purchases.

View Current Price on Amazon → Compare to similar external storage

*Price sourced from Amazon.com. Last updated 2026-08-17. Price and availability subject to change.

Bottom line: The Seagate Expansion Portable, 4TB, External Hard Drive, 2.5 Inch, USB 3.0, for Mac and PC (STKM4000400) is a niche pick — read recent reviews before buying in the external storage category, priced around $189.99. Compare close alternatives before committing.

Expansion portable drive is an easy-to-use solution for instantly adding storage to Windows or Mac—and taking those files on the go. Take advantage of fast data transfer speeds with USB 3.0 and consolidate files into a single location. Free up space on your computer with a simple drag and drop—file saving is that easy.

SpecPicks Verdict

SpecPicks scored Seagate Expansion Portable, 4TB, External Hard Drive, 2.5 Inch, USB… using a rating × review-volume × price-fit model applied to our editorial and benchmark analysis across the external storage category. Seagate's external storage lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Mixed or limited buyer feedback at this price point — focus your evaluation on recent reviews that specifically address build quality and long-term reliability, and shortlist one or two close alternatives before deciding.

Common buyer scenarios for external storage of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the Amazon listing before purchase. Prices, stock, and Prime eligibility update directly from Amazon's catalog and may have moved since this page was last verified.

Pros & Cons

Pros

✓ Drag-and-drop file saving
✓ Backed by Seagate's warranty and support channels
✓ Ships via Amazon with Prime eligibility and the standard returns policy

Cons

✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
✗ Price, stock, and Prime eligibility update from Amazon and may have changed since this page was last verified

Key Features

Sleek and simple portable drive design for taking photos, movies, music, and more on-the-go
Drag-and-drop file saving
USB 3.0 powered
Automatic recognition of Windows and Mac computers for simple setup (Reformatting required for use with Time Machine)
Enjoy peace of mind with the included limited warranty and Rescue Data Recovery Services
The available storage capacity may vary.

Full Specifications

Brand	Seagate
Color	Black
Item Width	8.1 centimeters
Model Name	Seagate Expansion
Read Speed	120 megabytes_per_second
Unit Count	1 Count
Form Factor	Portable
Item Length	12.2 centimeters
Media Speed	120 megabytes_per_second
Connectivity	USB
Model Number	STKM4000400
Compatibility	PC, Mac
Built-In Media	Seagate ExpansionPortable Drive 4TB USB3.0
Item Type Name	Hard Drive
Hard-Drive Size	4 TB
Mfr Part Number	STKM4000400
Number of Items	1
Special Feature	Portable
Hardware Platform	Mac, PC
Installation Type	External Hard Drive

Ready to buy?

Seagate Expansion Portable, 4TB, External Hard Drive, 2.5 Inch, USB 3.0, for Mac and PC (STKM4000400) is available on Amazon with Prime shipping and the full Amazon returns policy. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

View Current Price on Amazon →

*Price sourced from Amazon.com. Last updated 2026-08-17. Price and availability subject to change.