How do I add storage to an Xbox Series X?

You have two routes. For next-gen Series X and S games, you need an official storage expansion card that plugs into the back. For older Xbox One and backwards-compatible games, any cheap external USB hard drive works perfectly and saves you a lot.

Can I use a normal external hard drive on Xbox Series X?

Yes, for Xbox One and backwards-compatible games you can store and play them straight from a cheap external USB drive. Newer Series X and S optimised games must sit on the internal drive or an official expansion card, but you can park them on the external when not playing.

What is the cheapest way to expand Xbox storage?

A standard external USB hard drive is by far the cheapest option. It holds your whole library and runs older games directly, so you only need the pricier expansion card for the latest titles you are actively playing.

How Do You Add Storage to an Xbox Series X?

Published: August 7, 2026

Live answer · Amazon.com

Pulling live prices…

📊 As of October 23, 2026, the typical external 3.5″ HDD (4TB+) on Amazon.com is $48.08/TB or $0.048/GB, widest choice around $32.22/TB, with some as cheap as $23.57/TB across 408 live listings.

Sourced from real discussions on r/XboxSeriesX and r/xbox, cross-checked against live PricePerGig listings.

I was fortunate enough to get my hands on an Xbox Series X in the November before the first Christmas they came, out, and I was thrilled I’d never have to worry about storage space because I bought the X and that has a massive 1TB of storage.

Well my satisfaction didn’t last long, and before Christmas holidays even ended there was infact a rather large 4TB 3.5” ‘bare dock’ also parked next to, utterly ruining the aesthetics, but I was re-downloading all, well, almost all, my whole back catalog of Xbox games, so looking good - no, fast and easy - yes.

The table above shows the live price per TB for external 3.5 inch hard drives of 4TB and up on your marketplace, which is exactly the drive that ruins your console’s aesthetics and saves you a fortune.

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The two ways to add storage

Here is the lay of the land.

The official expansion card. A small card that slots into the back of the console and behaves just like the internal SSD. It is the only way to play the newest Series X and S optimised games from extra storage. It is also expensive.
A standard external USB hard drive. Cheap, huge, and it plugs straight in. It stores your whole library and runs older Xbox One and backwards-compatible games directly.

Most people need a mix, and leaning on the external drive is how you keep the cost down.

The cheap trick: use an external drive

This is the money saver, so pay attention.

A plain external USB hard drive is dirt cheap per TB compared to the expansion card. And it does a lot.

It plays all your Xbox One and backwards-compatible games directly, no copying needed.
It stores your newer Series X and S games too. You cannot play those straight off it, but you can park them there and copy them back to the internal drive in seconds when you want to play, far faster than redownloading.

So a big external drive holds your entire collection for very little money, and you only lean on the pricey card for the latest titles you are actively playing.

The optimal way to have your games on the Xbox is very similar to a PC. Download everything to the hard drive, and when you want to play them move them to the internal drive. The Xbox software will actually insist on this, otherwise it will not play a Series X game. That is to say, a Series X game must be on the internal drive, or at least on a high speed expansion card, before playing.

To be clear about what runs straight off the external: on an Xbox Series X or S you can play directly off ‘any old’ USB hard drive you plug in, but only 360 or Xbox One games.

2.5 inch or 3.5 inch?

You’ll find many people online recommending a ‘portable’ hard drive, one of the 2.5 inch varieties. Yes if it’s an SSD inside, no if it’s a hard drive, is what I say. Like you, I bought the most powerful console in existence, and I do not want to wait for games to load any longer than I have to.

As discussed in the 2.5 inch vs 3.5 inch question, a 3.5 inch spins faster, providing faster load times, and I’m sold at that. An extra power wire is neither here nor there for me, and particularly since a 3.5 inch is usually cheaper per TB, I’m getting faster game loads at a cheaper price. Win win.

Yes you can use a 2.5 inch. Yes, if you’ve money to burn you can use a portable SSD, but at that point you should probably just consider the expansion drive.

When you actually need the card

To be fair, the expansion card has its place.

If you play a lot of the newest Series X and S games and hate shuffling them on and off the internal drive, the card gives you more instant, ready to play next-gen space.

For heavy players of cutting-edge titles, it is convenient. For everyone else, the cheap external drive plus the internal storage covers it.

How to spend the least

The smart approach.

Buy a big, cheap external USB hard drive using the best price per TB on the live table above.
Use it to hold your whole library and play all your older games directly.
Only buy the expansion card if you genuinely need more ready-to-play next-gen space.

That gets you loads of storage for a fraction of the all-card cost.

The bottom line

To add storage to an Xbox Series X, pair a cheap external USB hard drive with the official expansion card only if you really need it.

The external drive holds everything and runs your older games directly for very little money. Check the live price per TB above, grab a roomy external drive, and keep the pricey card for the few latest games you actually play.

Go get the best priced external drive you can, at least 2TB and 4TB ideally so you never worry about storage space again on your xbox.