I was just reorganizing some files in my Documents folder and I found an unidentified folder. In the finder, when you click Macintosh HD, I have the following folders: Applications, Developer, Library, private, System, User Guides and Information, and Users. I recognize all of them but "private". And it's just like that... lower case, all the other files the first letter is in caps. There is nothing in that folder that identifies any software. It has four folders in it: etc, tftpboot, tmp and var. All of the folders have stuff in them except "tftboot" which is empty. Can anyone identify what this "private" folder is? I have 2 other macs and they are running mostly the same software and neither of them has a folder anywhere on the hard drive called "private". Do you think I can delete it? It's nearly 4.5 GB. Is this an Alum Macbook file?