Cutting features to do opposite of clipping in ArcGIS Desktop?

What´s the easiest/smartest way of getting the opposite output of the clipping tool?

I just need the area of feature A1 which is not covered by feature A2 in a new Layer/File.

Now, I get the result by union´ing both features and deleting the "wrong" parts by hand.

I'm using ArcGIS Desktop 10.

Answer

You can use the Erase Tool in ArcToolBox. According to ESRI website :

"The Erase tool is used to perform overlay analysis on feature classes. This tool creates a feature class from those features or portions of features outside the erase feature class."

Have a look at this webpage, they have really nice explanations.

To do an "Erase" using a Basic level license see https://gis.stackexchange.com/a/103754/115