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How to Increase the System Partition Size in Windows 10

Your Windows 10 system partition is running out of space? This must be a pain because you can’t install more apps. You can increase the size of your Windows 10 system partition to make it more spacious. Windows has actually a default tool — Disk Management — that you can you to manage drive partition. However, it’s a bit tricky to be used to increase the system partition. In this post, we will show you how to increase the Windows 10 system partition using a third-party partition manager called AOMEI Partition Assistant.

In most cases, the Windows system is installed in the C drive (C:) so we will show you how to increase the C drive.

AOMEI Partition Assistant is a freemium tool. The paid version comes with a feature to allocate free space from a certain drive to another drive (i.e. from D drive to C drive). If you are not objected to spending money, you can use the paid version to ease your job. In this post, we will use the free version.

How to use AOMEI Partition Assistant to increase Windows 10 system partition

Here is the idea. We will resize the D drive to create an unallocated disk space. We will then add the unallocated space to the C drive.

Before getting started, make sure you have installed the AOMEI Partition Assistant app on your Windows 10 computer. You can download the binary file of the app (the EXE file) on its official website. Double-click the binary file to install it on your computer. Launch the app once installed.

Right-click the D drive and select Resize/Move Partition.

Drag the bar on the left side in the right direction. Click the OK button.

The step above will create a new unallocated space before the D drive. Next, right-click the C drive select Resize/Move Partition and drag the bar on the right side in the right direction. Click the OK button.

The changes you made above won’t be applied until you click the Apply button. So, click the Apply button which lies on the upper-left corner.

Please note that you might see more drives on the AOMEI Partition Assistant than you usually see on the File Explorer. They are the drives used by the Windows system that were automatically created upon Windows installation. Never delete them unless you want your Windows system to get in trouble.

If you use Windows 10 Pro edition, you might see a partition between the C drive and D drive. This is an exclusive partition used by BitLocker. Again, never delete this partition. To allocated free space from the D drive to the C drive, you can first allocate the free space from the D drive to BitLocker drive and then allocated the free space from the BitLocker drive to the C drive.

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