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Add Unallocated Space on Windows 10 Partition

Why do I need to add unallocated space on Windows 10 partition?

Unallocated space refers to the disk space that does not belong to any partition and has no programs or data that can be written. This type of space can be used to store deleted files, but when the operating system saves another file in the same location, the previous data will be overwritten. In order to make the most of all their storage space, computer users can add unallocated space to partitions in Windows 10 or use unallocated space to create new partitions.

However, most users want to add unallocated space to other partitions in Windows 10. Over time, various files will accumulate on your system, eventually consuming a lot of space. This may cause an "insufficient disk space" warning on the system partition and slow down the computer. Most users will encounter this problem sooner or later, so how can we solve it?
Of course, there is a method for you. That is, adding unallocated space on Windows 10 partition, which means you can use the unallocated space to extend the partition. Then you can solve the problem of insufficient disk space in Windows 10.

How to add unallocated space on Windows 10 partition?
There are two common ways to add unallocated space to a partition. One is through the Windows 10 disk management tool, and the other is through third-party software.
1. Add unallocated space to contiguous partitions through Disk Management
Disk Management is a built-in tool in Windows 10 that can delete, expand, create, and format partitions. You can access this tool by right-clicking on this PC> Manage>Disk Management. When there is unallocated space next to the partition to which you want to add unallocated space, just right-click the partition and select "Extend Volume".

If the unallocated space shown in Disk Management is the extended partition, you cannot add it to the primary partition even if they are contiguous (please refer to this guide to move the free space out of the partition extended ). In addition, you cannot add any unallocated space to the logical partition.
If the unallocated space is not adjacent to the partition to be added, the "Extend Volume" option will be grayed out. In the screenshot below, you can see that the "Extend Volume" option in the pop-up menu is grayed out because there is no unallocated space next to partition C on Disk 0.
So why does this happen? The extended volume function will only be enabled when there is unallocated space next to the primary partition (that is, the target partition) or free space next to the logical partition.

Therefore, if you want to use Windows Disk Management, you must determine in advance whether your partition is compatible. If your partition is not supported and you want to add free or unallocated space to any partition, we recommend that you use a dedicated third-party tool.
2. Use third-party software to merge the unallocated space into any partition

AOMEI Partition Assistant Professional Edition is a powerful partition management tool, which can help you manage your partitions safely and effectively. With its "merge partition" function, you can add unallocated space on any partition (without losing any data), regardless of whether it is located directly behind the target partition.
The first step: install and run. Right-click the partition where you want to add unallocated space and select Merge Partition (for example, Partition C).
Step 2: Select the unallocated space, and then click OK.
Step 3: In the pop-up window, you will notice that the partition size has increased. To perform the operation, click Apply.
Merging partitions is not the only way to add unallocated space to a partition. To add unallocated space to another non-adjacent partition, you can also move the partition between the target partition and the unallocated space to the right, and then expand the adjacent unallocated space.
In addition, if there is no unallocated space on the disk to expand another drive, you can use the "allocate free space" function to directly add the free space of one partition to another partition.

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