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.NDF File Extension


File Type SQL Server Secondary Database File
File Format File
Common? No
File Description Secondary database file used by Microsoft SQL Server; created when the primary .MDF database becomes too large (such as when there is no disk space left); may also be manually added to the SQL Server File Group to distribute data between the two files.

NDF files are typically stored on a different hard disk or partition than the primary database file; each NDF file uses the same filename as the corresponding MDF file, such as "mydb.mdf" and "mydb.ndf."
Program(s) that open ndf files Windows: Microsoft SQL Server

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/ndf