Installing an app to run from an external HD I need to install an Adobe Air application on an external hard drive (the app puts a lot of data in local storage "/Users/$User/Library/Preferences/", and all this data only fits on an external HD).

Is it possible to install an app (Air or otherwise, since other apps put data in the user's library) so that it will exclusively use storage on an external HD? If so, how should I proceed?
If the app doesn't let you configure where to store files, you can symlink the folder to your desired location.


Move the folder where the data is stored to the new location.
Run the following to symlink the folder:

ln -s /Volumes/externalname/folder ~/Library/path/to/folder



You can move the application by itself, but that won't change where the app stores data files.