How to make Steam scan existing files when there is no disk space left

I have a 120 GB SSD that I just installed. I moved Tom Clancy's Rainbow Six Siege over to it so I can have faster loading times in the game. It takes up almost all of the storage space that the drive has. Now when I go into Steam and try the classic "Install" trick to make it see the files, it says I don't have enough disk space.

Also, I already did set the drive as a Steam download library correctly. I also transferred over the appmanifest file and restarted Steam but when it finished validating, it told me that, I don't have enough disk space.

Is there a way around the checking of free space on the disk?

Assuming you downloaded and installed Rainbow Six Siege through Steam, the best way to move your game files is to let Steam itself move the game:

• Right-click the game in your library
• go to 'Properties'
• go to the 'Local Files' tab
• Here you find the option to 'Move Install Folder...'.

In your case, I suggest moving the files back to their original folder, and take that route.