Yes, you can play Xbox Series S games from an external hard drive, but with limitations
The short answer is yes, it is possible to play Xbox Series S games from an external USB hard drive. However, there are some limitations compared to playing them from the internal SSD. Let me explain…
The Xbox Series S comes equipped with a 512GB custom NVMe solid state drive (SSD), which is far faster than traditional external hard disk drives (HDDs).
Microsoft implemented a new Xbox Velocity Architecture for the Series S/X that takes full advantage of the internal SSD‘s speeds. This enables breakthrough performance like near-instant load times, Quick Resume, and more.
So if you want the optimal next-gen gaming experience, Xbox Series S/X games need to be run from the special internal SSD.
Why external HDDs can‘t deliver the full next-gen experience
The problem with using a regular external USB hard drive is that even high-speed HDDs can‘t match the raw speeds of the Xbox Series S/X‘s internal SSD.
Let‘s compare some specs:
| Spec | Xbox Series S SSD | External HDD |
|---|---|---|
| Interface | Custom NVMe | USB 3.2 Gen 1 |
| Max Sequential Read Speed | 2.4 GB/s | Up to 160 MB/s |
| Max Sequential Write Speed | 640 MB/s | Up to 160 MB/s |
| Random Read IOPS (4K) | 400,000 | Up to 1,500 |
| Random Write IOPS (4K) | 330,000 | Up to 1,500 |
As you can see, the Xbox‘s SSD blows away even good external HDDs in key areas like sequential transfer speeds and random I/O performance.
This super-fast storage is what enables the Velocity Architecture to instantly load assets from storage into the console‘s memory. It minimizes latency while gaming.
External HDDs have much higher latency that disrupts this process. So they can‘t fully take advantage of Velocity Architecture optimizations.
That‘s why you‘ll get an error if you try loading an Xbox Series S/X enhanced game directly from external storage. The game requires the internal SSD to leverage Velocity Architecture benefits.
External storage is still useful for cold storage
Now with all that said, external USB hard drives are still very useful for storing your Xbox Series S games.
The gameplay may suffer if you try running next-gen games directly from external storage. But you can certainly use it to archive games for later when your internal SSD fills up.
According to Microsoft, the average download size for Xbox Series S/X games is around 30-50 GB.
That means the 512GB SSD in the Series S can likely fit 10-17 average sized games before you need to start thinking about external storage. Of course, storage requirements vary wildly between games.
Here is a quick estimate of how many games you can fit based on install size:
| Game Install Size | Est. # of Games (512GB) | Est. # of Games (2TB HDD) |
|---|---|---|
| 30 GB | 17 games | 67 games |
| 50 GB | 10 games | 40 games |
| 80 GB | 6 games | 25 games |
| 100 GB | 5 games | 20 games |
As you can see, a 2TB external drive can store a ton more games as cold storage compared to the 512GB internal SSD.
So my recommendation is to take advantage of external drives to build a large Xbox game library. Then you can transfer the games you are actively playing to the internal SSD when needed.
Tips for managing limited SSD space
To maximize the 512GB of storage on the Series S, follow these tips:
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Only keep 2-3 active games on the internal SSD that you are currently playing. Archive the rest on external storage.
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Delete old screenshots and game clips that have been uploaded to the cloud to free up space.
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Uninstall the campaign portion of games after completing it if you only play multiplayer.
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Take advantage of Xbox‘s compression algorithms that can shrink game sizes by up to 40% on cold storage.
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Consider buying the $220 Seagate 1TB Expansion Card if you need more fast internal storage.
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An external SSD connected via USB 3.2 Gen 2×2 offers faster transfer speeds than a HDD when archiving games.
Why Xbox Series S uses a 512GB SSD
You may wonder why Microsoft only included a 512GB SSD in the Series S, rather than a larger 1TB or 2TB drive.
There are a few reasons driving this decision:
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Cost – higher capacity NVMe SSDs are still expensive. The 512GB drive helps hit the $299 price point.
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Target performance level – analysis likely showed 512GB was "good enough" for the expected usages of Series S gamers.
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Expectation of external storage use – Microsoft knew most fans would augment with external HDDs/SSDs.
While the 512GB is small by today‘s standards, remember that games are optimized to take full advantage of the Velocity Architecture. So quality is more important than sheer capacity.
I hope this helps explain the Xbox Series S storage situation! Let me know if you have any other questions.