"I had a Database File and I want to attach this MDF file to SQL Server 2014. However, whenever I try to attach the file, I am receiving following error message :The header for file ….\MSSQL\DATA\xxxx_data.mdf' is not a valid database file header. The FILESIZE property is incorrect. (SQL Server Error 5172). After surfing a lot, I found that MDF file has corruption in its header. I tried expert solution given in various forum websites but failed to fix header corruption, I am still getting the same error message. I have no idea how to deal with SQL database corruption. Can anybody suggest me any solution to fix this error? Thank you in advance!" SQL Server stores its physical database in MDF file and the first page of this file comprises the information of MDF file header. The header page keeps the information about the entire database like file signature, size etc. While attaching the MDF file in SQL Server, sometimes users encounter 5172 error code. This error generally occurs when the MDF file becomes corrupted or damaged.


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