Checks whether data and log files are placed on separate logical drives. Placing both data and log files on the same drive ...

Checks whether data and log files are placed on separate logical drives. Placing both data and log files on the same drive can cause contention for that drive and result in poor performance. Placing the files on separate drives allows the I/O activity to occur at the same time for both the data and log files. The best practice is to specify separate drives for the data and log when you create a new database. To move files after the database is created, the database must be taken offline. Move the files by using one of the following methods:

* Restore the database from backup by using the RESTORE DATABASE statement with the WITH MOVE option. 
* Detach and then re-attach the database specifying separate locations for the data and log devices. 
* Specify a new location by running the ALTER DATABASE statement with the MODIFY FILE option, and then restarting the instance of SQL Server. 

Note:  This policy cannot detect separate physical devices through mount points.