Working with the Computer Folder in Mac OS X Lion
In Mac OS X Lion folder structure, the Computer folder is the top level of the hierarchy. The Computer folder shows all the storage devices (hard drives, CD- or DVD-ROM, USB flash drive, and so forth) that are currently connected to your Mac. The following steps show how you can start at the Computer folder and drill down through the folder structure:
To find the Computer folder, choose Go→Computer or press Shift+Command+C.
This Computer folder is called Bob LeVitus’s MacBook Pro, and it contains a hard-drive icon (Lion HD) and a Network icon, with which you can access servers or other computers on your local network.
If you don’t see a Computer icon in your Sidebar, choose Finder→Preferences, click the Sidebar icon at the top, and then select the Computer check box. You can change the computer name in the Sharing System Preferences pane, which you can access by launching the System Preferences application (from the Applications folder, the Dock, or the Apple menu) and then clicking the Sharing icon.
You might have more or fewer icons in your Computer folder than you see here (depending on how many disks you have mounted).
Double-click the icon that holds your Mac OS X stuff.
(Technically, this drive is called your boot drive.) Here, that hard drive is called Lion HD. If you haven’t changed yours, it’s probably called Macintosh HD.
Check out the folders you find there.
You should see at least four folders (unless you’ve added some; if you installed the Xcode programming tools, for example, you have more).