Seagate
Seagate Expansion Portable, 2TB, External Hard Drive, 2.5 Inch, USB 3.0, for Mac and PC (STKM2000400)
Bottom line: The Seagate Expansion Portable ($149.99 on Amazon as of 2026-10-06): 2TB capacity in a 2.5-inch bus-powered body, no wall adapter to carry; main trade-off: spinning 2.5-inch mechanism, so transfers trail any external SSD at this price.
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*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.
Pros & Cons
Pros
- ✓ 2TB capacity in a 2.5-inch bus-powered body, no wall adapter to carry
- ✓ Auto-detects Windows and Mac on plug-in; no driver install or setup wizard
- ✓ Rescue Data Recovery Services included alongside the limited warranty
- ✓ Drag-and-drop workflow, no proprietary backup software to learn or bypass
Cons
- ✗ Spinning 2.5-inch mechanism, so transfers trail any external SSD at this price
- ✗ USB 3.0 Type-A, not USB-C; recent MacBooks and laptops need an adapter
- ✗ Time Machine use requires reformatting the drive out of the box
- ✗ Usable capacity lands under the labeled 2TB, per Seagate's own note
Manufacturer description
The Seagate Expansion Portable gives you 2TB of drag-and-drop storage in a 2.5-inch enclosure that slips into a laptop bag without a second thought. It draws power over the USB 3.0 cable, so there is no wall adapter to pack alongside it, and it mounts automatically on both Windows and Mac once plugged in. That makes it a practical answer for photo libraries, video projects, and music collections that have outgrown an internal SSD. Setup is deliberately minimal: connect the drive, then drag files across. Seagate's approach here is external storage without software layers, backup schedulers…
SpecPicks Verdict
SpecPicks scored Seagate Expansion Portable using a rating × review-volume × price-fit model applied to published specs and reviews 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. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.
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 retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.
Frequently Asked Questions
Does this work with a Mac without extra software?
Yes, it is automatically recognized by both Windows and Mac computers on plug-in. However, using it as a Time Machine backup target requires reformatting the drive first.
Do I need to plug it into a power outlet?
No. The drive is USB 3.0 powered, drawing everything it needs through the data cable, so there is no separate AC adapter to carry with it.
How much of the 2TB can I actually use?
Somewhat less than 2TB. Seagate notes that available storage capacity may vary, which is standard across hard drives due to formatting overhead and capacity measurement conventions.
What happens if the drive fails and I lose my files?
Each drive includes Rescue Data Recovery Services along with a limited warranty. Check the product listing for the current coverage term and what the recovery service includes.
Does it come with backup software I have to install?
No installation is required for basic use. The drive is built around drag-and-drop file saving, so you copy files across in your file manager like any other volume.
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 | STKM2000400 |
| Compatibility | PC, Mac |
| Built-In Media | Seagate ExpansionPortable Drive 2TB USB3.0 |
| Item Type Name | Portable Hard Drive |
| Hard-Drive Size | 2 TB |
| Mfr Part Number | STKM2000400 |
| Number of Items | 1 |
| Special Feature | Portable |
| Hardware Platform | Mac, PC |
| Installation Type | External Hard Drive |
Ready to buy?
Seagate Expansion Portable, 2TB, External Hard Drive, 2.5 Inch, USB 3.0, for Mac and PC (STKM2000400) is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.
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