Hi, Until yesterday, I didn't know that when you delete an item and empty the trash bin, that the item doesn't actually get deleted from the computer! I just learned about the option to empty trash securely, but it was a couple of days too late. I temporarily moved over a folder from my external hard drive onto my macbook air, and it was 40-50 gigs. Once I was done with it, I deleted the folder. I noticed that after I put it in the trash and emptied the trash, it really didn't change the available space on my macbook very much! I then learned that I'm supposed to empty trash securely if we want to truly delete the item from the computer. So then I try the erase free space option in disk utility and after a couple of hours, it still didn't really do much. What can I do to recover the 40-50 gigs of space?? Please help!