http://blogs.technet.com/beatrice/archive/2008/11/19/the-hidden-database-in-sql-server-2005-and-2008.aspxHave you ever had to move your master database? Or have you ever opened the folder which contains your master database? Both cases - if that ever happened to you, you should already know about the Resource Database - a hidden, read-only database introducedit-ITCommunityServer 2.1 SP1 (Build: 61025.2)