My supervisor has one of those tiny macbook air with 60GB hard drive. He ran out of space. He was running Windows XP virtual machine. He didn't need it anymore so I figured out how to delete the XP virtual machine and gained 17GB of space back. He mentioned he thought that a 30GB partition was created and the 17GB was gained, but an additional 13GB could be recaptured for storage. Is there a partition on his machine that is now being "unused" that could be captured back to his main storage? I know NOTHING about MAC's. Can someone please tell me how to check this, or how to uninstall any virtual machine to gain more space? I always thought a virtual machine would only be allocatted enough storage to "house" the image and grow as needed. Is there a hidden partition?