The SQL Server database file has got corrupted or damaged due to several reasons such as virus infection SQL bugs, software & hardware malfunctions etc.. Then all the databases of SQL Server MDF file can't be accessed by users. In this situation you can run DBCC CheckDB command. If this command doesn't work properly then you can use external software such as SQL database file recovery software. This tool instantly & efficiently repairs SQL database file & perform MDF file recovery process without any trouble. SQL database file repair tool has a very user friendly graphical interface to ensure quick recovery of entire database of SQL Server MDF file & directly export in your SQL Server version 2008 r2, 2008, 2005 & 2000. Demo version is a one of the best feature of this tool which can help you to repair SQL database file & preview the repaired database but you can't save it .mdf format. For saving repaired database .mdf format in your SQL Server, you have to purchase full version of SQL database file recovery tool at $129. Get more information about this tool from here: http://www.sqlrecovery.co.uk/sql-database-file-recovery