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Windows 10 built-in Disk Management has the ability to shrink volume and extend volume. In the Windows "Disk Management" tool click the "Create and Format Hard Disk Partitions" option. The top pane shows you a list of your partitions, the bottom one shows you a graphical representation of your storage devices. Right-click a partition and select Shrink Volume to resize it. You can only shrink a partition if there is enough free space. The partition you will want to shrink is the one that says it is an NTFS partition which is both active and primary.