this post was submitted on 27 Jan 2026
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Steam Hardware

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Should I use which file system for Proton and Wine prefixes on Lutris or Steam with an external SSD or microSD card under SteamOS ?

In the Bazzite documentation says "FAT32 and exFAT are unsupported . Both filesystems do not support symbolic links which is required for Proton prefixes to work properly. However, there are scenarios where a microSD card is formatted to exFAT may work in some cases, but this method is unsupported as something the Bazzite maintainers do not plan to accommodate."

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[–] bjoern_tantau@swg-empire.de 4 points 1 day ago

On BTRFS you could use deduplication to make the prefixes take up approximately no extra space. But that requires you to run a deduplication program every once in a while.

Its compression feature can also save some space and decrease load times.

But the impact of this stuff isn't that big. Much easier to just go ext4 and be done.