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Position : DiskGenius - Help - Active Partition (Mark Partition as Active)
Active Partition (Mark Partition as Active)

An active partition is a primary partition on a hard drive set as the bootable partition that contains operating system. Only one partition on each hard drive can be set as an active partition.

To active a partition, please right-click on the primary partition and select "Mark Partition As Active" from context menu.

Active Partition

If you want to remove Active mark for the partition, you can right-click on it and select "Remove Partition's Active Mark", as follows:

Active Partition