Hello. A month ago, I bought my first Mac and I am still learning about all the little neat things about OS X. Over the past week, I have been erasing programs that came preinstalled with Mac OS X Snow Leopard, programs like iDVD and iSync. Every time I delete stuff, I right click on the trash and hit 'Empty Trash.' One day, I stumbled upon a feature of 'Secure Empty Trash.' Now I have looked up what it does, but I am still not entirely sure. I did however find an article on Apple's support site that mentioned Disk Utility -> Empty Free Space. So I turned on Disk Utility and I clicked on my Mac OS partition, pressed 'Erase' and then pressed Erase Free Space. As I am typing it, it has about an hour and a half left to do. Now I thought that this would entirely remove every file that I ever deleted so that they cannot even be recovered later. Removing files makes me think - more disk space. Now as the Disk Utility is going, I am noticing that my available disk space is slowly becoming slower. It started with 201GB and is down to 192GB about 10 minutes later. I am confused, is this how it's supposed to work? If it is removing files, how come the available space is becoming smaller? Thanks in advance everyone!