mount.steamos

mounts or unmounts SteamOS filesystem partitions, used primarily for accessing

TLDR

Mount every SteamOS partition from a disk under one directory

$ sudo mount.steamos [/dev/sdX] [/mnt]

Leave the home partition out

$ sudo mount.steamos -o nohome [/dev/sdX] [/mnt]

Leave the overlays out as well

$ sudo mount.steamos -o nohome,nooverlay [/dev/sdX] [/mnt]

Unmount everything it mounted there

$ sudo mount.steamos -u [/mnt]

List the options it accepts

$ mount.steamos -h

SYNOPSIS

mount.steamos [options] device mountpoint

mount.steamos mounts or unmounts SteamOS filesystem partitions, used primarily for accessing Steam Deck storage when booted from another operating system or recovery media.SteamOS uses a complex partition layout with multiple overlays for system updates and user data separation. This tool handles the specific mount requirements, including the A/B root partitions, overlay filesystems, and home directory.The command simplifies what would otherwise require multiple mount commands with specific options for each partition.

PARAMETERS

-o, --options _opts_

Mount options (nohome, nooverlay, etc.)

-u, --unmount

Unmount all partitions under the specified directory

-h, --help

Display help information

CAVEATS

Requires root privileges. Designed specifically for SteamOS partition layouts (Steam Deck). The device should be a complete disk device (e.g., /dev/sda), not individual partitions. Ensure SteamOS is not running when mounting its partitions from another system.