Unallocated space is part of disk space that is not belong to any volume. Beside creating new volume, Unallocated space can be moved and combine to other partitions. Windows native Disk Management and diskpart command tool cannot move Unallocated space or any partition. Therefore, to accomplish this task, you have to run third party software.
While moving Unallocated space, all files in associated contiguous partition should be moved to new location, too, so there's potential data loss risk if some error happens. You'd better back up first and run safe partition software. Among these software, NIUBI Partition Editor has advanced 1-Second Rollback, Virtual Mode and Cancel-at-well technologies to protect system data. In addition, it is much faster because of the unique file-moving algorithm. It has free edition for Windows 10/8/7/Vista/XP home computer users.
In this article, I'll show you detailed steps how to move Unallocated space to the left/right or end of a disk, and what to do if you want to move Unallocated space from one disk to another.
Windows Disk Management and diskpart command can only merge Unallocated space to the left contiguous partition. Unallocated space can't be added into the right contiguous or any non-adjacent partition. The typical example is that Extend Volume is disabled for C drive in Disk Management after shrinking D. If there's a tool that is able to move Unallocated space to the left side of D, then Extend Volume will be enabled .
Download NIUBI Partition Editor and you'll see all disks with partition structure and other information. There's 20GB Unallocated space is on the right side of drive D:
Follow the step to move Unallocated space to the left side of drive D:
Right click drive D: and select "Resize/Move Volume", drag middle position towards right in the pop-up window.
Right click drive C: and select "Resize/Move Volume" again, drag right border towards right in the pop-up window.
If you want to move Unallocated space to the right side of E: drive, it is similar. Right click E: and select "Resize/Move Volume", drag middle position towards left in the pop-up window. If you want to extend E drive with this Unallocated space, you can combine with NIUBI Partition Editor without moving Unallocated space to the right side. To do this, drag left border towards left in the pop-up window.
Watch the video how to move and combine Unallocated space:
In some computers, C drive is full but there is no other volume or not enough free space on the same disk. Some people want to move Unallocated space to C drive from another separated disk. No software can do this, because a 256GB physical hard disk can't be decreased to 200GB or increased to 300GB.
In that case, you have to copy this disk to another larger one with NIUBI. Extra space in the larger disk will be shown as Unallocated, then you can combine to C drive and other partitions, follow the steps in the video:
Conclusion: Windows native tools cannot move Unallocated space, you need to run 3rd-party software that is safe. Follow corresponding method above according to your down disk partition structure. Besides moving and extending partition, NIUBI Partition Editor helps do many other disk and partition operations.