Sidebar
Finder Sidebar
This plist contains the various items on the sidebar of your finder window. You can see the order listed starting with 0 for the first item of the list. You can also see the visibility settings, some items such as iDisk will remain listed in the file as “Never Visible” even if the user removes the item from the list manually. This list may come to use because it stores information on previously accessed items such as disks or removable devices.
Copy and Paste this into the terminal
plutil -p /Users/$USER/Library/Preferences/com.apple.sidebarlists.plist
In this situation I was able to see that the disk I used to install OS X was still visible on the sidebar items list.
Here is an example of the standard listing order for items on the Finder sidebar.