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How to Easily Split Partitions with AOMEI Partition Assistant?

How to split partition? Splitting partition could help you divide one partition into two partitions. With help of this function, you could quick partition your hard drive and make more partitions you want.

AOMEI Post By AOMEI Updated June 19, 2024

Overview of split partition?

When you buy a new computer, usually, there is only one partition (namely C drive) on the hard disk. The Windows and some Microsoft applications are all on it. After a period of time of using, not few personal data are added into the partition. Therefore, system, applications and private data are all on one partition. It is difficult to manage all kinds of matters in one partition. Besides, there is something much more serious. Since all the things are on one partition, if the partition is attacked by hijack or virus, all the data will lose. For the system and applications, you can get them back by reinstall them.
To reinstall the system, you must have the original installation CD and you may have to get product license from the manufacturer. However, for the personal data, they are not so lucky and are destined to miss forever. Nevertheless, had you have more than one partition and have the partitions stored different categories of data, you will not encounter the situation mentioned above. To have more partitions, the easiest way is to split the only partition.
Splitting partition is to turn one partition into two. By taking the action several times, you can have a few partitions on one hard disk. It is very convenient if you need more partitions to store various kinds of data, such as family photos, software applications or personal business files etc.
With the help of this function, you can split one big partition into two or more smaller ones. Without this service, if you want a new partition on your hard disk, there are only two ways you can choose from. The first is to shrink a partition to get some unallocated space first, and then create a new partition with the unallocated space. The second is to delete an old partition to produce unallocated space to make new one. Usually, there is data on the old partition, so you should transfer the data or make a backup of them before deletion. Both ways are troublesome!
However, if you have AOMEI Partition Assistant which helps you to split your partition, you do not have to bother yourself with the tiresome work and you will have more than one new partition without sacrifice your old partitions.

How to split partition with AOMEI Partition Assistant

Before you do

  • Download and install AOMEI Partition Assistant on a Windows computer.
  • You can only split the unused space of a partition to create a new partition. If a partition is totally used up, the partition will be unable to be split.
  • This operation may change the original location for your data, so we advise you to learn the tutorial "How to Safely Partition" before executing this operation.

This tool is very useful for you to split one single partition into two. If you would like to use this feature, please upgrade to a paid version of AOMEI Partition Assistant Professional, Server, or above versions.

How to split partition step by step

1. Launch Partition Assistant. Right-click the partition you want to split, and select "Split Partition". (Take C partition as an example)

C Drive Split

2. Drag the arrow leftwards or rightwards to specify the size of the original partition and new partition. Or you can directly type in the number of the size you want to give to your new/original partition, and click "OK" to continue./screenshot/en/pro/split-partition/split-partition.png
Tips: You can tick "Allow partition alignment to optimize the performance of SSD" if the partitions are on an SSD drive.

Specify Partition Size

3. You can preview the split operation by viewing the "Pending Operations". To commit the "Pending Operations", please click "Apply" and "Proceed".


4. A window will pop up to ask you to select a mode, either "Restart into Windows PE mode" or "Restart into PreOS mode" to execute the operation because it is an operation to shrink the current system drive. Please select one mode you prefer to execute the operation.

Select Mode


With the help of feature "split partition", you can partition a hard drive to make more than one partition on a disk.

This feature is mainly used to partition your drive to some extent. It can be used in the below situations:

  • Split and makemore partitions to separately store and manage your data. For example, you can make different partitions for music, video, data, and so on.
  • Make more partitions to reduce the risk of all data loss. If there is only one partition on the drive, a system recovery or reinstallation operation will overwrite all data on the drive.


  • The splitting process will take some time, so allow your computer to finish this task before using it for anything else.

  • When there are four primary partitions on an MBR disk, if you want to split one of them, the partition that is being split will be converted to logical partition automatically.

  • If one MBR disk has four primary partitions, the program would not allow you to split the system partition or boot partition, unless you could convert one of other partitions from primary to logical partition, and then the program will allow you to split system partition. The new generated partition will be automatically set as logical partition.

  • Besides splitting partition, you can also get new partition by creating partition with an unallocated space.



Q: When I right-click partition C, the option "Split Partition" is grayed out. Why and how to active the option?

A: This situation might be caused by the numbers of the primary partition. If you already have four primary partitions, to solve this problem, you need to change one of your primary partitions into logical. After that the option will be active.

Q: Is it possible to split an exFat partition? 

A: No, it is unable to split an exFat partition. When you right-click the exFat partition, the "Split Partition" option will be grayed out.