Seagate Expansion 3TB Portable External Hard Drive USB 3.0 (STEA3000400),Black

Name: Seagate Expansion 3TB Portable External Hard Drive USB 3.0 (STEA3000400),Black
Brand: Unbranded
SKU: B00ZTRXTPW

Status: Seagate Expansion 3TB Portable External Hard… (3TB hard drive): Unavailable on Amazon as of 2026-10-18 04:19 UTC. Closest in-stock match (same 3TB hard drive): Seagate Expansion 3TB Desktop External Hard…, $153.60 on Amazon as of 2026-10-21 08:15 UTC (price may vary). eBay sellers may still list this model new or used.

View Current Price — $153.60 🛒 Search eBay for this model

Bottom line: The Seagate Expansion 3TB Portable External Hard Drive USB 3.0: 3TB capacity in a bus-powered portable case - no separate AC adapter to pack; main trade-off: ships Windows-formatted; Mac use requires a reformat that erases the drive.

Unavailable on Amazon as of 2026-10-18 04:19 UTC

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Currently unavailable on Amazon. Not the same product — 3 in-stock alternatives with matching specs:

Same 3TB hard drive: Seagate Expansion 3TB Desktop External Hard… — $153.60 on Amazon as of 2026-10-21 08:15 UTC (price may vary).

View Current Price — $153.60

Same 3TB hard drive: Seagate Expansion 3 TB USB 3.0 Desktop External… — $171.17 on Amazon as of 2026-10-20 22:15 UTC (price may vary).

View Current Price — $171.17

Same 3TB hard drive: WD 3TB Elements Portable External Hard Drive — $187.72 on Amazon as of 2026-10-21 16:15 UTC (price may vary).

View Current Price — $187.72

Original listing (currently unavailable) → Compare to similar external storage

By Mike Perry, Founder & Editor-in-Chief · Listing data updated 2026-10-18

Mike Perry — Hardware researcher since 2014. For external drives and portable storage, synthesises manufacturer specs and independent reviews rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference. About the author →

Pros & Cons

Pros

✓ 3TB capacity in a bus-powered portable case - no separate AC adapter to pack
✓ USB 3.0 SuperSpeed interface for large photo and video transfers
✓ Zero setup on Windows - auto-recognized, no driver or software install
✓ Falls back to USB 2.0 ports on older PCs and laptops

Cons

✗ Ships Windows-formatted; Mac use requires a reformat that erases the drive
✗ Single USB cable powers and connects it - no redundant power option
✗ Spinning platter design, so it is more shock-sensitive than an SSD
✗ Usable capacity is below the advertised 3TB after formatting

Manufacturer description

The Seagate Expansion 3TB Portable External Hard Drive (STEA3000400) adds three terabytes of drag-and-drop storage to any Windows machine over a single USB 3.0 cable. There is no power brick to carry and no software to install: the drive draws power from the USB port itself and the Windows operating system recognizes it automatically, so you can plug it in and start moving files within seconds. That makes it a straightforward way to offload a growing photo, video, or game-capture library off your internal drive and free up space that your system can use for performance. The USB 3.0 interface…

SpecPicks Verdict

SpecPicks scored Seagate Expansion 3TB Portable External Hard Drive USB 3.0 using a rating × review-volume × price-fit model applied to published specs and reviews across the external storage category. Compare with similarly-priced alternatives in the external storage category before committing. 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 the Seagate Expansion 3TB work with a Mac?

Not out of the box. The drive ships formatted for Windows drag-and-drop use; Seagate notes it must be reformatted for Mac, and reformatting erases everything on the drive unless you back it up elsewhere first.

Do I need a power adapter for this drive?

No. The Seagate Expansion portable drive is powered by the USB port, so the included USB cable handles both data and power - there is no separate wall adapter to carry.

Will it work if my computer only has USB 2.0 ports?

Yes. The drive is compatible with both USB 3.0 and USB 2.0. You get SuperSpeed transfer rates on a USB 3.0 port and slower USB 2.0 speeds on older machines.

Is any software installation required to use it?

No. Windows recognizes the drive automatically, with no software to install or configure. You save files by dragging and dropping them, right out of the box.

Do I actually get the full 3TB of space?

Not quite. Seagate states the available storage capacity may vary, since formatting overhead and the decimal-versus-binary capacity difference reduce usable space below the labeled 3TB.

Key Features

Easy and simple to use - Plug it in and go
Fast file transfers with super speed USB 3.0
Compatible with USB 3.0 and USB 2.0
Powered by USB port
Drag and drop file saving for Windows, right out of the box. Please note: Product needs to be reformatted if it is to be used with Mac. Reformatting the drive will erase all content unless it is backed up to another drive
The available storage capacity may vary.

Full Specifications

Brand	Seagate
Color	Black
Model Name	Expansion
Unit Count	1.0 Count
Form Factor	Portable
Connectivity	USB
Model Number	STEA3000400
Compatibility	Mac
Built-In Media	Seagate ExpansionPortable Drive 3TB USB3.0
Hard Disk Size	3 TB
Item Type Name	Seagate Expansion STEA3000400 - Hard Drive - 3 TB - USB 3.0 - Black
Hard-Drive Size	3 TB
Mfr Part Number	STEA3000400
Number of Items	1
Hardware Platform	PC
Installation Type	Plug In
Compatible Devices	Compatible with USB 3.0 and USB 2.0
Data Transfer Rate	1 Gigabits Per Second
Enclosure Material	Unspecified
Hard Disk Interface	USB 1.1

Ready to buy?

Amazon shows no buyable offer for Seagate Expansion 3TB Portable External Hard… at the last check. The closest in-stock match with the same 3TB hard drive is Seagate Expansion 3TB Desktop External Hard…. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

View Current Price — $153.60