I am having problems with my Macbook Pro. I have everything backed up through Time Machine, though I'm still going through everything trying to figure out where all of my files are, so I'm manually dragging everything to a folder on my desktop. The folder is about 150GB of photos, videos, and files, though when I check Get Info on my 500GB hard drive, it indicates that I only have around 90GB available and I can not figure out what is taking up that space. Is there a way to determine this? Thanks.