How do I make a partition active in Windows 10?

Method #2: Set Active Partition with the help of Disk Management

• Press shortcut key WIN+R to open RUN box, type diskmgmt.msc, or you can just right-click on Start bottom and select Disk Management in Windows 10 and Windows Server 2008.
• Right-click on the partition you want to set active, choose Mark partition as active.

What happens when you mark a partition as active?

Marking a partition as active on a basic disk means that the computer will use the loader (an operating system tool) on that partition to start the operating system. At various times the need to mark a partition as active arises. This will show you two ways of doing so.