If you have multiple partitions with multiple operating systems, you can set the appropriate active partitions. All primary partitions will be imaged first while logical drives are assigned according to subsequent letters. When the system is booted, operating system on active partition will perform drive image in order to assign drive letters to primary partitions and logical partitions. Usually, the Partition C: in Windows systems is set as active partition by default. Well, an active partition is a computer boot partition, where the startup files of operating system are installed.
