I made an image of a partition on my hard drive. The partition takes up 8gb but the actual content in it is below 4gb, the rest is just empty space. The image, no matter what I do or how I do it, keeps turning out to be 8gb as well, and then when I mount it, it has more than 4gb of empty space. How do I shrink the disc image to remove the empty space?! Nothing seems to be working. I tried hdiutil resize in an attempt to resize the dmg to 4gb, and it returned an error saying that is below the minimum size...? I also tried hdiutil compact and it returned an error saying Function not implemented. Is there anything I can do in order to shrink this dmg to delete all the useless space? It's important, because I need to burn it to a DVD.