Seagate

Seagate Storage Expansion Card for Xbox Series X

Name: Seagate Storage Expansion Card for Xbox Series X|S 4TB Solid State Drive - NVMe Expansion SSD for Xbox Series X|S (STJR4000400)
Brand: Seagate
SKU: B0CNXZS9C5

Status: Seagate Storage Expansion Card for Xbox Series X (4TB NVMe SSD): Unavailable on Amazon as of 2026-10-21 16:16 UTC. Closest in-stock match (same 4TB NVMe): Fikwot FN955 4TB NVMe SSD M.2 2280 PCIe Gen4x4, $549.99 on Amazon as of 2026-10-22 04:20 UTC (price may vary). eBay sellers may still list this model new or used.

View Current Price — $549.99 🛒 Search eBay for this model

Bottom line: The Seagate Storage Expansion Card for Xbox Series X: 4TB is the largest expansion card sold - roughly 4x the Series X internal SSD; main trade-off: only works with Xbox Series X|S; no PS5 or PC compatibility.

Unavailable on Amazon as of 2026-10-21 16:16 UTC

As an Amazon Associate, SpecPicks earns from qualifying purchases. Full disclosure →

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

Same 4TB NVMe: Fikwot FN955 4TB NVMe SSD M.2 2280 PCIe Gen4x4 — $549.99 on Amazon as of 2026-10-22 04:20 UTC (price may vary).

View Current Price — $549.99

Same 4TB NVMe: fanxiang 4TB NVMe SSD PCIe Gen 4 Gaming SSD for… — $549.99 on Amazon as of 2026-10-22 04:20 UTC (price may vary).

View Current Price — $549.99

Same 4TB NVMe: fanxiang 4TB SSD NVMe PCIe Gen4 M.2 SSD for PS5 — $529.99 on Amazon as of 2026-10-21 22:24 UTC (price may vary).

View Current Price — $529.99

Original listing (currently unavailable) → Compare to similar ssds & storage

By Mike Perry, Founder & Editor-in-Chief · Listing data updated 2026-10-21

Mike Perry — Hardware researcher since 2014. For SSDs and PC storage upgrades, 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 is the largest expansion card sold - roughly 4x the Series X internal SSD
✓ Runs Series X|S optimized games natively; USB drives cannot
✓ Matches internal SSD load times via Xbox Velocity Architecture
✓ Quick Resume works across titles stored on the card

Cons

✗ Only works with Xbox Series X|S; no PS5 or PC compatibility
✗ Proprietary format means no reuse as a general external drive
✗ Series S owners pay 4TB pricing on a console with a smaller game library
✗ Card sits proud of the rear port rather than sitting flush

Manufacturer description

Designed in partnership with Xbox to seamlessly play Xbox Series X|S games from the internal SSD or the expansion card without sacrificing graphics, latency, load times, or framerates. The only 4TB expansion card—and highest capacity available—that maximizes Xbox Series X storage, allowing you to collect thousands of games across four generations of Xbox without sacrificing performance. Officially licensed storage expansion card designed using Xbox Velocity Architecture to provide faster load times, richer environments, and more immersive game play.

SpecPicks Verdict

SpecPicks scored Seagate Storage Expansion Card for Xbox Series X using a rating × review-volume × price-fit model applied to published specs and reviews across the ssds & storage category. Seagate's ssds & 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 ssds & 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

Will this work with my Xbox One or PS5?

No. The card fits only the dedicated storage expansion port on Xbox Series X and Series S consoles. It is not compatible with Xbox One, PS5, or PC.

Can I just use a cheaper USB external drive instead?

Only for Xbox One and older titles. Xbox Series X|S optimized games must run from the internal SSD or this expansion card, so a USB drive can store them but not play them.

Are games slower when installed on the card?

No. Seagate built the card on the Xbox Velocity Architecture in partnership with Xbox, so load times, framerates, latency, and graphics match the internal SSD.

Does Quick Resume still work from the expansion card?

Yes. You can switch between multiple titles in seconds whether they sit on the internal SSD or on the card.

What warranty does the 4TB card come with?

Seagate includes a 3-year limited warranty. Check the product listing for current terms and registration details in your region.

Key Features

Designed in partnership with Xbox to seamlessly play Xbox Series X|S games from the internal SSD or the expansion card without sacrificing graphics, latency, load times, or framerates.
The only 4TB expansion card—and highest capacity available—that maximizes Xbox Series X storage, allowing you to collect thousands of games across four generations of Xbox without sacrificing performance.
Officially licensed storage expansion card designed using Xbox Velocity Architecture to provide faster load times, richer environments, and more immersive game play.
Quick resume means gamers can switch between multiple titles in seconds—directly from the internal SSD or the expansion card.
Enjoy long-term peace of mind with the included 3-year limited warranty.

Full Specifications

Size	4TB
Brand	Seagate
Color	Black
Model	STJR4000400
Warranty	2 Year Manufacturer
UnitCount	1
ReleaseDate	2025-06-15T00:00:01Z
Manufacturer	Seagate
ItemPartNumber	STJR4000400
Full listing title	Seagate Storage Expansion Card for Xbox Series X\|S 4TB Solid State Drive - NVMe Expansion SSD for Xbox Series X\|S (STJR4000400)

Ready to buy?

Amazon shows no buyable offer for Seagate Storage Expansion Card for Xbox Series X at the last check. The closest in-stock match with the same 4TB NVMe is Fikwot FN955 4TB NVMe SSD M.2 2280 PCIe Gen4x4. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

View Current Price — $549.99