Joel Oleson's Blog - SharePoint Land : Don't be afraid of Prescan - Part 1: http://blogs.msdn.com/joelo/archive/2007/04/13/don-t-be-afraid-of-prescan-part-1.aspx Example of good PreScan results: 07/19/2006 17:17:01 Scan finished without failure
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Read the complete post at http://blogs.technet.com/sharepoint_attack/archive/2008/06/19/prescan-ghosted-unghosted-pages.aspx