How to Change Partition Size in Windows 10 with Free Software?

December 23, 2014

Changing partition size in Windows 10 is a common method to use storage space reasonably. While AOMEI Partition Assistant Standard allow you do this easily.

Usually, there is only a partition made by manufacturers. But in order to demand the needs of users who plan to store data separately. You need to change partition size in Windows 10 and then create partition.

Furthermore, day after day, you may discover the free space in your each partition is different. For instance, in your Windows 10, C: drive is 60GB, D: drive is 50GB, while with the increasing temporary files or caches in C: drive, the free space is less and less. But there is enough free space in D: drive. In this situation, changing partition size in Windows 10 is a good choice to remit the low disk space in C drive.

No matter which situation you come across, you require to a way to resize partition in Windows 10. Do you know how to change partition size in Windows 10? We will introduce the ways as follows.

Disk Management in Windows 10

Disk Management is a built-in tool in Windows 10, which is able to shrink/extend/create/delete/format partition. With this tool, you should shrink partition to gain unallocated space and then extend the partition with unallocated space. You can enter Disk Management in Windows 10 by following ways:
1, click This PC>Manage>Disk Management
2, Click start menu and type cmd to open command line and then input compmgmt.msc and then click Enter.

Then you can solve the problem which troubles you. But before you extend partition, you should know the Extend Volume is only available when there is unallocated space adjacent to the partition which you try to extend, otherwise the button will gray out.

AOMEI Partition Assistant Standard

AOMEI Partition Assistant Standard is a free software which is designed for partition management. It allows you to resize partition, extend partition without losing any data easily in Windows 10. With this software, the friendly used interface enables you to finish the operation in few simple ways. Compared with Disk Management, AOMEI Partition Assistant allows you to extend partition, no matter the unallocated space is adjacent to the partition you try to operate or not. Furthermore, this free software is more powerful than Disk Management.

Resize Partition

Step1: Download AOMEI Partition Assistant Standard, install and launch it. Right click the partition you want to resize (eg. Partition D)and then chooseResize Partition.

Step2: Left move he bar to get unallocated space from partition D and clickOK.

Step3: Click Apply to perform the operation and then you will see the unallocated space is behind partition D.

Extend Partition: after you get unallocated space by resizing partition, you can use it to extend partition to avoid low disk space.

Before you do:

  • You can merge two or more parts of unallocated space into a partition. The unallocated space just need to be behind the partition, whether it is adjust to the partition or not. Besides, you can only merge 2 partitions in one time, and the two partitions must be adjacent.
  • You can merge data partition into system boot drive; however, you cannot merge system boot drive into data partition.
  • Step1: Open the software and right click the partition you want to extend (eg. Partititon C) and choose Merge Partitions

    Step2: Select the unallocated space and then click OK .

    Step3: To execute the operation, please click Apply .


    You can only click “Apply” for one time after resize and extend partition.

    If there is unallocated space which is no contiguous behind partition C, you can move partition, after this you will find the unallocated space is next to partition C. and then you can extend partition C with the unallocated space.

    Besides change partition size in Windows 10, you can make bootable CD, Convert between MBR and GPT, migrate OS to SSD, Move partition and more. All these features work perfectly on Windows 8.1, Windows 8, and Windows 7/Vista.