Seagate Expansion STKP4000400 4 TB Desktop Hard Drive

Name: Seagate Expansion STKP4000400 4 TB Desktop Hard Drive - External - Black - Desktop PC, MAC Device Supported - USB 3.0-1 Year Warranty - Retail
Brand: Unbranded
SKU: B092R5B6ZP

Status: Seagate Expansion STKP4000400 4 TB Desktop Hard… (4TB hard drive): Unavailable on Amazon as of 2026-10-20 10:23 UTC. Closest in-stock match (same 4TB hard drive): Seagate Portable 4TB External Hard Drive HDD, $189.99 on Amazon as of 2026-10-21 12:20 UTC (price may vary). eBay sellers may still list this model new or used.

View Current Price — $189.99 🛒 Search eBay for this model

Bottom line: The Seagate Expansion STKP4000400 4 TB Desktop Hard Drive: 4TB capacity in one drive - room for large photo, video, and game libraries; main trade-off: needs an AC power adapter, so it is not a bus-powered travel drive.

Unavailable on Amazon as of 2026-10-20 10:23 UTC

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

Same 4TB hard drive: Seagate Portable 4TB External Hard Drive HDD — $189.99 on Amazon as of 2026-10-21 12:20 UTC (price may vary).

View Current Price — $189.99

Same 4TB hard drive: Seagate Expansion STKP4000400 4 TB Desktop Hard… — $237.39 on Amazon as of 2026-10-21 10:19 UTC (price may vary).

View Current Price — $237.39

Same 4TB hard drive: Seagate Expansion Desktop — $194.95 on Amazon as of 2026-10-21 12:20 UTC (price may vary).

View Current Price — $194.95

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

By Mike Perry, Founder & Editor-in-Chief · Listing data updated 2026-10-20

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

✓ 4TB capacity in one drive - room for large photo, video, and game libraries
✓ 7200 RPM 3.5-inch mechanism, faster than typical 5400 RPM portable drives
✓ Includes 3 years of Rescue Data Recovery Services
✓ Plug-and-play: power adapter plus USB cable, no software install

Cons

✗ Needs an AC power adapter, so it is not a bus-powered travel drive
✗ 3.5-inch desktop form factor takes up desk space
✗ USB 3.0 interface, not USB-C or Thunderbolt
✗ Time Machine users must reformat the drive before backing up

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 large, simple place to park photo libraries, video projects, game installs, and document archives. It uses a 3.5-inch 7200 RPM drive in a black desktop enclosure and connects over USB 3.0, with backward compatibility to USB 2.0, so it works with older machines too. Setup is deliberately plain: plug in the power adapter, connect the USB cable, and the drive is automatically recognized by Windows and Mac computers, no software install required. Mac…

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 this Seagate Expansion drive work with a Mac?

Yes. It is automatically recognized by Windows and Mac computers for simple setup. If you want to use it with Time Machine, you will need to reformat the drive first.

Do I need to plug this into a wall outlet?

Yes. This is a 3.5-inch desktop drive, so it ships with a power adapter. You connect both the power adapter and the USB cable to get it running.

How fast is the drive and what port does it use?

It is a 7200 RPM 3.5-inch drive with a USB 3.0 interface that is also backward compatible with USB 2.0 ports.

Is any data recovery service included?

Yes. Seagate includes 3 years of Rescue Data Recovery Services with this drive, plus a 1-year warranty on the retail unit. Check the product listing for current warranty terms.

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

Actual storage capacity varies because of differences between decimal and binary capacity calculations, so the formatted figure your operating system reports will be lower than 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

Connectivity	USB
Compatibility	PC, Mac
Full listing title	Seagate Expansion STKP4000400 4 TB Desktop Hard Drive - External - Black - Desktop PC, MAC Device Supported - USB 3.0-1 Year Warranty - Retail

Ready to buy?

Amazon shows no buyable offer for Seagate Expansion STKP4000400 4 TB Desktop Hard… at the last check. The closest in-stock match with the same 4TB hard drive is Seagate Portable 4TB External Hard Drive HDD. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

View Current Price — $189.99