How to move the Downloads folder (in Mountain Lion) to another disc
It is possible to do this from within the Terminal. Launch it from Applications &rarr; Utilities &rarr; Terminal.


Move the Downloads folder to your second drive, replacing Data (the name of my second drive) with whatever yours is called. You may be prompted for your OS X password.

sudo mv ~/Downloads /Volumes/Data/Downloads

(Optional) Create a symlink to allow you to access your new Downloads folder in the old location. Again, replace Data with the name of your second drive.

ln -s /Volumes/Data/Downloads ~/Downloads



This has just worked for me on OS X 10.8.1.