Active Partition (Mark Partition as Active)

An active partition is a primary partition on an MBR disk that is set as the bootable partition containing the operating system. Only one partition on a hard drive can be marked as active. GPT disks do not use the concept of active partitions.

Mark a partition as active:

Step 1. Select the primary partition you want to mark as active, then right-click it and choose "Mark Partition As Active" from context menu.

Step 2. Click Save All button to make the change take effect. Then the previous active partition will have its active flag removed.

Remove active flag from a partition:

Step 1. Right-click the partition you want to remove the active mark from, and select "Remove Partition's Active Mark" from the context menu.

Step 2. Click Save All to save the partition table. After saving, the partition will no longer be active, and the disk may have no active partition.