Set active

If you have several primary partitions, you must specify one to be the boot partition. For this, one partition can be set as active. As a rule, a disk can have only one active partition.
To set an active partition:

  1. 1. Select a primary partition to set as active from the list in the main window of EaseUS Partition Master.
  2. 2. Select Partitions > Set active.  
  3. 3. By clicking OK, you will add the pending operation of setting active partition.