Hard drive icon is from http://www.opensecurityarchitecture.org/cms/library/icon-library
Folder icon is from http://www.freevectorartwork.org/downloads/2318/folder-icons-svg-vector-art.html
File icon is from http://www.openclipart.org/detail/25398/architetto----carta-by-anonymous-25398
Application icon is from http://www.iconspedia.com/icon/monkey-3015.html