MDF File stands for master database file, it stores the structure of the database such as tables, views, procedure, Rules, Trigger and functions and finally the data. It is the file format of the MS SQL database, and entire database is stored in the .mdf file so that data can be easily accessed, entered and modified.

But sometimes .mdf gets corrupted due to any internal or external error and if the .mdf file gets corrupted then it can corrupt the entire database or make it inaccessible. This file contains the structure of the database and all operations are executed on to a single .mdf file so that it can be easily got corrupted.