My hard drive space on my mac seems to be disappearing. I have a 160GB macbook. It is owned by my company, and when it was given to me 2 months ago, it had just over 120GB free space. I recently purchased an external hard drive, and I transferred all my iTunes content, photos, etc to my external drive. All I think is left on my internal drive is my applications folder (just under 16GB), and system files and OS. However, my hard drive now shows only about 30GB free space.