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.NDF File Extension

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File TypeSQL Server Secondary Database File

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CategoryDatabase Files


File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.


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.

More Information

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." Also, the NDF file cannot be opened by SQL Server without the MDF file attached.

Program(s) that open .NDF files
Microsoft Windows LogoWindows
Microsoft SQL Server 2014
Updated 5/4/2015