So, when I turn the AirPort on on my MacBook Pro you can see the hard drive space go down on the bottom of a finder window. When I turn AirPort off the the GB available on the hard drive stays the same. I'm not downloading anything. that I know of. Is some virus downloading in the background that I can't control? I did a full scan with VirusBarrier Express and it says that there are no infected files on the computer. Any help would be greatly appreciated. Thanks!