Datanumen SQL Recovery

Solution for Following Common Errors and Problems in SQL Server MDF File

Arrow xxxx.mdf is not a primary database file. (Microsoft SQL Server, Error: 5171)
Arrow The header for file ‘xxxx.mdf’ is not a valid database file header. The FILE SIZE property is incorrect.（Microsoft SQL Server, Error:5172）
SQL Server detected a logical consistency-based I/O error: incorrect checksum

SQL Server detected a logical consistency-based I/O error: torn page
You delete some records or some tables in database by mistake.

Complete List of Common Errors and Problems in SQL Server MDF file