I wanted to put something on thumb drive to transfer over to my other mac but it was too big for it so I made space by transferring some of the files on to my mac. I ended up emptying out my thumb drive to make room. So I had to delete the files on my thumb drive once I moved the files to my mac since moving them basically just makes copies. However, my empty thumb drive still reads as if nothing was ever removed. I have a empty 4GB thumb drive that says I only have 1 plus GB left? Can someone explain this?