Finding dead track in iTunes library

Do you keep your music on an external hard drive? Have you ever started up iTunes with it disconnected, just get the dead track exclamation point all over your library ("!")

Well here's the solution, just quit iTunes and re-open with the external hard drive connected. iTunes will rescan library and resurrect dead tracks .
[http://forums.macosxhints.com/showthread.php?p=298683]