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NIUBI Partition Editor
MiniTool Partition Wizard Free

During use, you must have encountered a case where drive C is full. However, the data drive D, E, F still has a lot of space. And you want to take some space from the merged data drive to drive C.

Windows also has a disk partitioning function using the "Disk Management" software. However, it can only merge contiguous drives. For example, drive C merges with drive D, but drive C cannot be merged with drive E because drive D is in the middle.

Unless you Format drive D, it can be merged. But if you want to keep the data, then only using 3rd party software to solve this problem.

I suggest 2 free hard drive partitioning software for you.

NIUBI Partition Editor

NIUBI offers users a free version to merge non-contiguous partitions in Windows.

To merge partitions, just drag and drop. I feel it is very intuitive, not filling in numbers like other applications.

DOWNLOAD the free version NUIBI
For example, you need to merge drive E into drive C. Right click on drive E and select Delete Volume. Drive E will change to state Unallocated.
Right-click D: select "Resize/Move Volume", drag the D drive to the right. Then you will see the drive Unallocated is shifted to the left and right next to the C drive.
Right click C: select "Resize/Move Volume", drag right margin of C drive to the right to merge Unallocated into the drive OLD.
Select Apply to execute the merge command. If you change your mind, just click Undo to cancel pending operations.