With SteamTool, you can install the games in your Steam Library across more than one hard drive. Games on the second hard drive will continue to play, download and update as normal, since Steam is still able to access them using their original folder names.

How to Get Started
  1. Create an empty folder on the additional drive that will have games installed on it.
  2. Open SteamTool, and select the folder that you just created.
  3. SteamTool is now ready for you to transfer games. From now on, all you have to do is:
  4. Choose a game from the list and click 'Move to Storage' or 'Move to Steam'.

Important Warnings: Learn more.