Best overall: WD 4TB My Book

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Western Digital's My Book series offers a set of solid performers when it comes to external hard drives. We found the 4TB option struck the ideal balance between storage capacity and affordability. It adds another $88.79 to the Xbox One or Xbox One X, but the addition of 4TB of storage will ensure you'll be able to bolster the game collection for many months to come.

Bottom line: The WD My Book offers great value, reliability, portability, and capacity.

One more thing: It can also be purchased in 6TB and 8TB variants, as well as double hard-disk drive (HDD) configurations.

Why the WD 4TB My Book is the best external hard drive for Xbox One S

Not only are you investing in a quality storage brand in Western Digital, but the prices of the company's My Book line of external enclosures are incredibly competitive. Some purchasers have even found the drives contained within the products to be priced more as standalone units than inside the My Book protective casing, so you know you're getting a solid deal for the Xbox One S or Xbox One X.

With games becoming more complex and sizes hitting insane numbers for downloads, it makes sense to pick up an external drive to offset some of the burdens, since the Xbox One S only comes with either 500GB, 1TB or 2TB of internal space, which simply isn't enough in 2017. Throw in a 4TB Western Digital My Book and you have up to 5TB of storage space.

The My Book itself is essentially a WD drive plugged into a daughter circuit board, which then runs via USB to the Xbox One S. That's pretty much it, aside from the protective plastic casing, of course. No thrills, no cool LED lighting, but when all you require the drive to do is spin up with the Xbox and store titles, that's pretty much all you could ever need in an external drive.

WD offers the My Book series in 2TB, 3TB, 4TB, 6TB, 8TB, 12TB and 16TB configurations. The latter two options are dual-drives, sporting larger cases with two drives inside. It all depends on how much you wish to spend.

How to choose and use external drives with Xbox One

Best SSD: Samsung 1TB 860 Pro

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Buying an SSD, especially one with a large capacity, in 2017 is still a more pricey option than a mechanical drive. Newer SSD solutions are becoming more affordable, but 1TB variants and above are still hundreds of dollars. Should you have the funds available and want to take full advantage of the increased read and write speeds of SSDs over traditional hard drives with games, the Samsung 860 Pro series ($427.99 for the 1TB model) is the best of the best.

Bottom line: It's expensive, reliable and super quick. Adding an external SSD to the Xbox One S will increase game load times.

One more thing: You'll need an external enclosure for internal drives like the Samsung 850 Pro. An example would be this unit from ORICO.

Best portable SSD: Samsung 500GB T5

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Sporting read and write speeds of up to 540 MB/s, the Samsung T3 external SSD package (around $150) is a great solution to improve performance and expand memory without decimating the bank balance. There's also no need to purchase cases or cables, as everything is already included.

Bottom line: It's a great option for those who wish to take advantage of an SSD without spending too much money.

One more thing: Shock resistance and secure encryption also make the cut.

Best Affordable HDD: WD 1TB My Passport

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Should you not require TBs of extra space, but want a portable drive you can take with you to various LAN events and Xbox parties, the My Passport family of drives are worth a look. The 1TB model will set you back just $49.00.

Bottom line: It's more affordable than other options but comes with substantially lower capacity. You'll be effectively doubling the storage available.

One more thing: You have a choice of some bold colors to bring the Xbox One and your surrounding furniture to life.

Best Capacity HDD: Seagate Game Drive Hub 8TB

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With a massive capacity of 8TB ($170.41), this Seagate Game Drive is ideal for those who need to store a colossal library of Xbox One titles on their console but only wish to make use of a single drive.

The additional benefit to the Game Drive Hub is that it returns the USB port you lose by plugging it in, and gives you an extra one on top for good measure. It's a little pricey, but it's one beast of a hard drive.

Bottom line: For the serious Xbox One gamer. You'll likely never run out of space.

One more thing: Provides two forward facing USB 3.0 ports as well as a ton of storage.

Conclusion

While you cannot go wrong when it comes to external hard drives, especially if you have a few units lying around and simply need to purchase an enclosure, we believe the best option for the Xbox One S and Xbox One X is the WD 4TB My Book. Not only does it add an insane amount of storage to the console, but also offers great reliability and portability.

Best overall: WD 4TB My Book

See at Amazon

Western Digital's My Book series offers a set of solid performers when it comes to external hard drives. We found the 4TB option struck the ideal balance between storage capacity and affordability. It adds another $88.79 to the Xbox One or Xbox One X, but the addition of 4TB of storage will ensure you'll be able to bolster the game collection for many months to come.

Bottom line: The WD My Book offers great value, reliability, portability, and capacity.

One more thing: It can also be purchased in 6TB and 8TB variants, as well as double hard-disk drive (HDD) configurations.

Updated June 1, 2018: Added the Seagate Game Drive Hub to the mix as the best choice for those wanting serious capacity.