Repartition Hard Drive in Windows 10 without Destroying Data

December 30, 2014

Repartitioning hard drive in Windows 10 may be the common need among PC or laptop users, which will optimize computer performance or help you manage data more easily.

About Hard Drive in Windows 10

Hard drive is a storage device which allows you to store applications, pictures, or other data after you create partitions on it. As for most Windows 10 users, there are 2 or more partitions to ensure different data can be saved separately, this can avoid the risk of data loss. But at some times, some users also need to repartition hard drive in Windows 10.

Why Need to Repartition Hard Drive in Windows 10?

There are different reasons causing you have to repartition hard drive in Windows 10. The most common one is that when you buy a new computer, usually there is only one partition for you to store system files, applications, and your personal data together. It is unsafe for your data, because if one day your system is crashed, your other data are under the risk of being lost. Therefore, in this situation you need to repartition hard drive to store data separately.

On the other hand, if you have enough partitions to store data, but with time goes by, your system drive is in low disk space thanks to the temporary files or caches. It is a bad thing for your computer performance. To solve the problem, you also need to repartition hard drive in Windows 10.

How to Repartition Hard Drive in Windows 10?

There is no doubt that Disk Management in Windows 10 is able to help you repartition hard drive by creating partition, shrinking partition or extending partition. But this tool has its own limitations. For instance, you can only shrink half size of a partition and the extending partition is only available when there is unallocated space next to the partition you are going to operate, or the extend volume will gray out. So you need another tool - AOMEI Partition Assistant Standard.

AOMEI Partition Assistant Standard is a free partition software which allows you to repartition hard drive without destroying any data. Besides this function, this partition manage software enables you to merge partitions, migrate OS to SSD, make bootable CD, copy partition and more useful features.

Before you do:

The partition shrinking operation will be performed under PreOS Mode and your computer will reboot when:

  • Shrink system and/or boot partition.
  • Shrink a partition on which the page file or AOMEI Partition Assistant installation file is on.
  • Shrink a partition where applications are running.

AOMEI Partition Assistant will suggest you close them or perform partition shrinking operation under PreOS Mode.

Shrink Partition

Step1: Download, install and launch the software. Right click the partition you want to shrink and then chooseResize Partition.

Resize Partition

Step2: Right move bar to decide how many size you would like to shrink from partition D, and then clickOK.

Right Move Bar

Step3: Click Apply to perform all the operations.

Click Apply

After click Apply, you will see there is unallocated space behind partition C, with the unallocated space, you can extend partition or create partition depending on your own needs.

Extend Partition

Step1:Right click partition C and then select Resize partition.

Resize Partition C

Step2: Right move the bar to add the unallocated space into partition C and then click OK.

Extend Partition C

Step3: Click Apply to execute all the operations.

Operate Extending Partition C.gif

Create Partition

Step1: Click unallocated space and then select Create Partition.

Create Partition

Step2:You can left move the bar to decide the size of the new partition you create with unallocated space and then click OK.

Left Move Bar

Step3: In the pop-up window, you can preview there is a new partition (partition F) in disk 1, to perform the operation, please click Apply.


No matter which method you choose, you can repartition hard drive in Windows 10 easily with AOMEI Partition Assistant. Furthermore, unlike Disk Management, you can create partition even there is no unallocated space on hard drive with this software.