By default, Steam downloads games to the home directory.
On my laptop, my home partition's size is only 15GB; therefore, I'd like Steam to download its games to my Data partition instead, which is much larger.
How can I achieve this?
Just move the folder to the data partition and create a symlink in its old place pointing to the new location. Something like this:
In Steam's case, there are a few extra files that you should move:
You can choose another drive directly in Steam. But than you have to choose this drive at every Download.
To change the default Download folder, i don't think symlink is the best way.
Just quit Steam (important!) and move the entire Steam folder to another location
and start Steam again. It says something like "can't find Steam, did you move it?" and than you can choose the new folder location.