SteamOS on PC: Installation Guide
Here is how I’ve installed SteamOS alongside Windows and few Linux distros on a chosen NVMe drive.
My way of choosing the correct NVMe drive is super silly but it works.
No Windows, Gentoo Linux, CachyOS, Mint or Fedora was harmed during production of this video.
Source - Mr Eng: • HOW TO INSTALL STEAMOS ON ANY DRIVE!
I recommend to check that other video if you want to install SteamOS on an SSD drive. Especially comments under his videos. Installing SteamOS on an SSD is more complicated but can be done.