By default, when you insert a blank disc, OS X asks you what you want to do with it. You can choose a few options: Open an application, ignore the disc, or run a script to perform a task. Also, if you insert a particular kind of disc (music, picture, dvd movie), you can choose what you want OS X to do with that too. Here is how to do this: First, go to the 'Apple menu', and choose 'System Preferences'. Next, choose 'CD & DVDs'. Now, click on the option you want to change via the drop down menu. Notice it will present you with multiple options, choose the one that suits your needs.