A full system drive with four games is a solvable problem. Steam and the Xbox app both move installed content, and the methods differ.
In **Steam**, add a second library folder and use **Move install folder** on the game. In the **Xbox app**, use **Manage > Move** per title. Never copy the folder by hand and expect the launcher to notice.
Both launchers want a new top-level folder rather than an existing one with content. Create an empty folder on the target drive and point the launcher at it.
Steam > Settings > Storage > Add DriveSteam lists each installed title with its size and offers a destination picker. The move copies the files, verifies them and rewrites the manifest in one step.
The Xbox app moves its titles through the settings of the app. The operation needs free space on the target and it can fail when the game is running.
Settings > Apps > Installed apps > Manage > MoveA library on a removable drive breaks when the letter changes. Assign a fixed letter in disk management before you move anything to an external drive.
diskmgmt.mscBoth launchers have a verify function. Run it once per game; it repairs a move that was interrupted by a power loss or a full drive.
Desktop shortcuts can still point at the old path after a move. Let the launcher recreate them rather than editing the target by hand.
The target drive is full or the file system does not allow files over 4 GB. Use NTFS, not FAT32.
The library folder is not attached to the launcher, or the drive letter changed.
Some games keep saves in the user profile. Check the save folder separately.
The manifest was not updated. Move the title with the launcher tool, not by hand.
Yes. Steam supports several, and a game lives in exactly one of them.
Yes. A running game locks its files and the move fails.
Move the title back to the original library with the same tool. The game folder and saves return to their previous location.
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