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Seagate Expansion STKP4000400 4 TB Desktop Hard Drive - External - Black - Desktop PC, MAC Device Supported - USB 3.0-1 Year Warranty - Retail

Seagate Expansion STKP4000400 4 TB Desktop Hard Drive

Bottom line: The Seagate Expansion STKP4000400 4 TB Desktop Hard Drive ($237.39 on Amazon as of 2026-10-21 10:19 UTC): 4TB capacity in a single 3.5-inch desktop enclosure; main trade-off: needs an external power adapter, so not bus-powered or portable. Another in-stock pick with the same 4TB hard drive: the Seagate Portable 4TB External Hard Drive HDD, $189.99 on Amazon as of (price may vary).

$237.39

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Buy on Amazon — $237.39 Compare to similar external storage

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

  • ✓ 4TB capacity in a single 3.5-inch desktop enclosure
  • ✓ 3 years of Rescue Data Recovery Services included
  • ✓ 7200 RPM spindle speed, faster than 5400 RPM externals
  • ✓ Auto-recognized by Windows and Mac, no driver install

Cons

  • ✗ Needs an external power adapter, so not bus-powered or portable
  • ✗ Only a 1-year retail warranty despite 3-year recovery coverage
  • ✗ Must be reformatted before Time Machine will use it
  • ✗ Usable space reads under 4TB due to decimal vs binary math

Manufacturer description

The Seagate Expansion STKP4000400 is a 4TB desktop external hard drive built for people who have run out of room on an internal SSD and want a straightforward place to park photo libraries, video projects, and archives. It ships in a 3.5-inch black enclosure with a 7200 RPM drive inside and connects over USB 3.0, with backward compatibility for USB 2.0 ports. Setup is deliberately plain: plug in the power adapter and the USB cable, and the drive is recognized automatically by Windows and Mac computers. If you plan to use it with Time Machine, you will need to reformat it first. Seagate…

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SpecPicks Verdict

SpecPicks scored Seagate Expansion STKP4000400 4 TB Desktop Hard Drive 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 4TB work with a Mac?

Yes. It is automatically recognized by Windows and Mac computers, but you must reformat the drive before using it with Time Machine.

Do I need to plug this drive into power?

Yes. This is a 3.5-inch desktop drive, so it uses an included power adapter plus the USB cable. It is not bus-powered like a portable 2.5-inch drive.

How fast is this hard drive?

It uses a 7200 RPM mechanical drive over a USB 3.0 interface and is backward compatible with USB 2.0. Seagate does not publish a transfer-rate figure in the listed specs.

What warranty and data protection come with it?

The retail package lists a 1-year warranty plus 3 years of Rescue Data Recovery Services. Check the product listing for current warranty terms in your region.

Why does my computer show less than 4TB of space?

Actual storage capacity varies because of the difference between decimal and binary calculations, so your operating system reports less than the advertised 4TB.

Key Features

  • Digital Storage Capacity - 4TB; Get an extra layer of protection for your data with the included 3 year Rescue Data Recovery Services
  • Form Factor - 3.5 Inches, Hardware Interface - USB 2.0/3.0, Drive RPM - 7200
  • Easy-to-use desktop hard drive—simply plug in the power adapter and USB cable
  • Automatic recognition of Windows and Mac computers for simple setup (Reformatting required for use with Time Machine)
  • Actual storage capacity may vary due to differences between decimal and binary calculations.

Full Specifications

ConnectivityUSB
CompatibilityPC, Mac
Full listing titleSeagate Expansion STKP4000400 4 TB Desktop Hard Drive - External - Black - Desktop PC, MAC Device Supported - USB 3.0-1 Year Warranty - Retail

Ready to buy?

Seagate Expansion STKP4000400 4 TB Desktop Hard Drive - External - Black - Desktop PC, MAC Device Supported - USB 3.0-1 Year Warranty - Retail 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 — $237.39

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

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Seagate Expansion STKP4000400 4 TB Desktop Hard Drive - External - Black - Desktop PC, MAC Device Supported - USB 3.0-1 Year Warranty - Retail
$237.39
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