A free program for Android, by madmack.

The FolderMount ROOT app lets you create and mount virtual SD cards on your Android device, allowing you to download large applications and games without worrying about running out of space.

Why use FolderMount?

With FolderMount, you can download large applications and games without worrying about running out of space. You can use the app to link your existing folders in your SD card to new folders in the external SD card, thereby populating the internal SD card with content that really exists on the external card.

This helps us free up space and have multiple games/apps with big data stored simultaneously without the need to uninstall.

For instance, if you have a game called “ABC” and you’re running out of space, you can use the app to link “/data/ABC/” in your SD card to “/data/Android/”.

You will see a dialog that asks you to authorize the app to access your SD card. If you grant the app access, it will download the game to your external SD card.

After you install the app, you can create a new folder pair in your SD card. It will have an icon for you to recognize it.