Allocate Free Space with Partition Assistant

March 11, 2022

This paper demonstrates how to allocate free space under the help of AOMEI Partition Assistant, you can increase the size of one partition quickly and simply.

How to Allocate Free Space?
The necessary to allocate free space

A user on a forum website asks: "Hello everyone, hope you can help. Stuck with one simple problem: how do i reallocate space between two partitions? I have shrunk one already - but it just created an empty volume on the same partition. How do i move it to another partition, which I want to become bigger? Thanks for your help. PPS: Oh, and BTW - I don't want to delete data on partitions! I just need to reallocate free space."

Allocating free space is a new function provided by AOMEI Partition Assistant which helps you to redistribute free partition space. This new function has improved the traditional way of resizing partition and users could allocate free space from one partition to another to enlarge the destination partition. Therefore, when you need to extend partition, you do not have to resize or shrink another partition to get free space first; you just need to directly transfer free space from source partition to destination partition to increase partition. It is very easy and fast.

You have to allocate free space when:
  • The target partition is out of space and it is in dire need to be enlarged so as to be able to continue to save files or folders and run fast and correctly.

  • You want to keep fewer partitions on the hard disk and make the management of your disks easier.

  • You want to make full use of the space you have by allocating the unallocated space on the hard disk to the existing partition.

  • You want to shrink the source partition and make all the partitions on the disk seem in average size.

How to Allocate Free Space from One Partition to Another?
Before you do
  • You can only allocate the free space from one partition to another. Besides, the allocated space should be less than or equal to the unused space of source partition in size. You can avoid distributing overloading unused room by taking reference of the size listed on the main interface.

  • If there are other applications running on the partition which you are going to perform, AOMEI Partition Assistant will notice you to close those applications by click “Retry” (it is also the recommended option) or to execute this operation in PreOS Mode by choosing “Restart Now” (Your computer will restart if you press this button) or just to click “Cancel Operations” to finish this operation by rebooting your computer and redoing it without opening those applications.

To allocate free space

To move free space from one partition to another partition taking advantage of AOMEI Partition Assistant Professional, you should download and install it before you can start. In addition, you’d better not to install it on the partition you are going to operate. The reason is as mentioned above; if you save it on the partition you plan to perform, then you need to make use of Partition Assistant to do the performance, thus you will in a destiny either to do it in PreOS Mode or to cancel it. In general, only several steps are needed to allocate free space to a partition.

The following will take how to allocate free space to d drive for an example.

Step 1. Launch AOMEI Partition Assistant, right-click the partition which you want to allocate free space from and select "Allocate Free Space". (As you can see from the following screenshot, I choose D partition as the source partition.)

Allocate Free Space

Step 2. As a result of step 1, you will get a pop-up window. Type in the size of the free space which you want to cut from D partition and this free space will be directly added into the destination partition. (Take the following screenshot as an example - I will allocate 243.81 GB’s free space from D partition to C partition.)

Allocate From D To C

Step 3. You can take a preview of the operation result before confirming start. Click "Apply" to execute this operation. In the pop-out window, you can see how much time it will cost you to finish this operation. You can also tick "Check partitions before execution" to go through the partition in case of any error in it. In default, this option is ticked.

Apply Allocate Free Space

Step 4. Wait until it finishes. Then, close the program to exit.


  • This operation may change the original location for your data but will not delete them, yet, in order to guarantee the safety of your data, we suggest you to learn the tutorial "How to Safely Partition" before executing this operation; you can back up the data on the disk to another safe place.

  • After executing the allocation operation, the program will take some free space from the source partition to the target partition. In other words, the source partition will be shrunk, and the target partition will be expanded.

After this performance, you can use the allocated space in the destination partition. Isn’t it convenient? Actually, you can enjoy much more convenience with the help of Partition Assistant. You can move partition, merge partitions, change partition type ID or serial number and things like that. All in all, with the help of AOMEI Partition Assistant, you can handle the partitions on your computer more easily.