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.”
Can confirm, I tried doing exfat for a Steam install on an external drive, and it just didn’t work at all. Ext4 and btrfs both have simlinks (although simlinks in btrfs are kinda weird) and work with Steam and emulation. Ext4 is the tried and true stable filesystem, and btrfs supports more modern features. I’ve always prefered stability to bleeding edge, so I use ext4, but it really is up to personal preference and what you need.