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Seagate Expansion 3TB Desktop External Hard Drive USB 3.0 (STEB3000100)
Seagate

Seagate Expansion 3TB Desktop External Hard Drive USB 3.0 (STEB3000100)

Bottom line: The Seagate Expansion 3TB Desktop External Hard Drive USB 3.0 ($269.99 on Amazon as of 2026-10-21 08:15 UTC): 3TB capacity consolidates photo, game, and archive files into one desktop drive; main trade-off: requires an external power adapter, so it is not bus-powered or portable.

$269.99

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By , Founder & Editor-in-Chief · Listing data updated

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.

*Price sourced from Amazon.com. Last updated 2026-10-21. Price and availability subject to change.

Pros & Cons

Pros

  • ✓ 3TB capacity consolidates photo, game, and archive files into one desktop drive
  • ✓ USB 3.0 SuperSpeed interface, backward compatible with USB 2.0 ports
  • ✓ No software to install; Windows recognizes the drive automatically
  • ✓ Drag-and-drop file saving works right out of the box

Cons

  • ✗ Requires an external power adapter, so it is not bus-powered or portable
  • ✗ Mac use requires reformatting, which erases all content on the drive
  • ✗ Seagate lists Windows 7 or higher only; no stated Linux support
  • ✗ No bundled backup software, unlike Seagate's Backup Plus line

Manufacturer description

The Seagate Expansion 3TB Desktop External Hard Drive is a plug-and-play storage upgrade for anyone whose photo library, game installs, or project archives have outgrown an internal drive. Seagate builds this Expansion desktop model around a USB 3.0/2.0 interface, so file transfers move at SuperSpeed rates on a USB 3.0 port and stay backward compatible with older USB 2.0 machines. Setup is genuinely minimal: connect the included power adapter and USB cable, and Windows recognizes the drive automatically with no software to install or configure. From there, saving is drag-and-drop straight…

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SpecPicks Verdict

SpecPicks scored Seagate Expansion 3TB Desktop 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. 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 the Seagate Expansion 3TB work with a Mac?

Not out of the box. Seagate ships it formatted for Windows, and Mac use requires reformatting the drive, which erases all content unless you back it up elsewhere first. Refer to Seagate's application guide before reformatting.

Do I need to install any software to use this drive?

No. The drive is automatically recognized by the Windows operating system, so there is no software to install or configure. Plug in the power adapter and USB cable, then drag and drop files.

Does it need its own power supply?

Yes. This is a desktop-class external drive, so it ships with a power adapter that plugs into the wall in addition to the USB cable. It is not powered by the USB port alone.

Will it work on an older computer with only USB 2.0?

Yes. The USB 3.0 interface is backward compatible with USB 2.0 ports, though transfers will run at USB 2.0 speeds. A SuperSpeed USB 3.0 port is required to hit full USB 3.0 transfer rates.

Do I actually get a full 3TB of usable space?

Not quite. Seagate notes that available storage capacity may vary, since formatting overhead and the drive's decimal capacity measurement reduce what your operating system reports as free space.

Key Features

  • Easy-to-use desktop hard drive—simply plug in the power adapter and USB cable; Fast file transfers with USB 3.0/2.0
  • System requirements: Windows 8, Windows 7 operating system
  • Drag-and-drop file saving for Windows, right out of the box
  • For Mac compatibility This hard drive requires reformatting. Reformatting the Drive will erase all content unless it is backed up to another drive. Refer to application guide for guidance on this.
  • The available storage capacity may vary.

Full Specifications

BrandSeagate
ColorBlack
Model NameSEAGATE (RETAIL)
Unit Count1 Count
Form Factordesktop
Media Speed160
ConnectivityUSB
Model NumberSTEB3000100
CompatibilityMac
Built-In MediaSeagate® Expansion Desktop Drive 3TB USB3.0
Hard-Drive Size3 TB
Mfr Part NumberSTEB3000100
Number of Items1
Special FeatureIncludes external power adapter
Hardware PlatformMac
Installation TypeExternal Hard Drive
Compatible DevicesPC
Data Transfer Rate5000 megabits_per_second
Enclosure MaterialPlastic
Additional FeaturesIncludes external power adapter

Ready to buy?

Seagate Expansion 3TB Desktop External Hard Drive USB 3.0 (STEB3000100) 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.

Buy on Amazon — $269.99

*Price sourced from Amazon.com. Last updated 2026-10-21. Price and availability subject to change.

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Seagate Expansion 3TB Desktop External Hard Drive USB 3.0 (STEB3000100)
$269.99
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