Im cleaning out files in my harddrive because its almost full (duh). Im checking each file in my harddrive to see which files I can erase and I came across something that is confusing. I opened my Hard Drive and revealed its files and these are the components and their respective sizes: APPLICATIONS - 12.12GB LIBRARY - 5.77GB SYSTEM- 5.91GB USERS - 55.42GB That totals up to 79.22GB. But when I right click on my Hard Drive and click "Get Info", it says here that I already used up 112.98GB and that I only have 7.49GB left available. (My total capacity is 120.47GB) So where is the 33.76GB?? Can anyone please tell me? Are there hidden files in my Hard Drive that I wasn't able to count? And what files can I delete in my HD? Are files in the Library folder all important? What can I delete from there? I'd really rather do this manually so please refrain from suggesting me disc clean up programs. But if you know a really good app, then okay, tell me.