Hard drives store system information and well as program files, documents and whatever else the user want to store on the computer. The hard drive is like a large filing cabinet with many drawers filled with folders. Each drawer contains similar files. For example, ‘drawer A’ might contain information regarding the operating system. In ‘drawer A’ there are folders which break down the files in the operating system. Another cabinet is ‘My Documents’ which contains sub-folders added by the user. The user adds documents to the sub folders to make it easier to retrieve later. The hard drive’s primary function is to store information.