You need to boot a partition editor, since you cannot move C while also booting from it. Then you will need to move E down to overwrite the unallocated space. This will move this space between D and E. Repeat this for D to have the unallocated space follow C. You should then boot into Windows and resize C. If your hard disk has unallocated space, you can use the Windows built-in disk management tool to either create a new partition with its own drive letter or, if the unused space follows another partition you use, you can extend that partition to make use of the space. Unallocated In WIndows 10 Disk Management I see: C: 54 GB NTFS 529 MB one 56 GB unallocated. I don't have an option to resize (guess there is this 529 one) but also I can't create new one in unallocated space. After using chkdsk there are no errors and file system is NTFS. I tried to resize with diskpart. Of course, you can also use the " Resize/Move Partition " function to realize it. Right-click on the Unallocated drive, and select Resize/Move Partition. Select the drive and click on Resize/move Partition. Do not forget to Apply the setting. If BitLocker is detected, you will be prompted to Turn Of BitLocker. Windows sometimes doesn't display extended partitions properly for reasons that I don't understand. 3rd party software seems to be more reliable. GParted shows the situation clearly on your screenshot: You have, in this order: 501 MB of unallocated disk space; 99.46 GB primary partition (NTFS, Windows root) 30 GB of unallocated space tsU6.

unallocated space windows 10 cannot use