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Do you want to extend your system partition?

As you know a fresh Windows 10 installation takes around 15GB of storage space.

And many PC users allocate a small storage space for their system partition when installing Windows. Sure you may not need lot of space in the early days… But after you install apps you start running out of space unless you change the installation directory to another drive.

In this guide you will learn how to extend your existing partition without having to reinstall Windows.

You will learn to extend the partition using two methods, the first using the built-in Disk Management Tool and the second using a free program named Minitool Partition Wizard.

Extending the System Drive Easily

Please backup your data before trying any of these methods. You can use an external drive to backup your data.

Extending System Partition Using Disk Management Tool

If you want to extend the system partition using the Disk Management tool you must see some unallocated space next to the system partition. If there is no unallocated space next to the system partition then you can’t extend the system partition and you won’t see “Extend volume” option.

However, in the next method you can successfully extend your system drive no matter what. But please backup your data first, you are responsible if any thing goes wrong.

Open Run using Windows+R key shortcut and type in diskmgmt.msc.


You can also search for Disk Management in Start.

Once Disk Management is opened, check if you have any Unallocated space next to your system partition. If you don’t have any, move to the next method.

If there is any, right-click on your system partition and choose “Extend Volume“.

Click on “Next” to display the maximum amount of space you can add to your system partition, it’s usually the unallocated space.

Here you will need to enter the amount of space you want to add to your system drive.

The recommended amount of space is the maximum available space, so enter the maximum value and click “Next“.

Click “Finish” to end up the process.

Windows may ask you to restart your computer.

Extend System Partition Using MiniTool Partition Wizard Home Edition

There are lot of tools to manage hard drives but Partition Wizard is the best free program in the market to help you manage hard drives and partitions in Windows.

You are right. It’s not as popular as other similar tools, but it’s the best among other free partitioning programs in the market.

This program, unlike the built-in Disk Management tool, will help you extend the system partition even if your don’t have unallocated space. It will take the required free space from a partition that have enough storage space.


Start by downloading Partition Wizard Home edition, it’s free and works on both 32-bit and 64-bit operating systems.

Install Partition Wizard by following the simple instructions, then launch it using the Desktop shortcut.

After you launch the program, click on “MiniTool partition Wizard Free“.

Select your system partition, here it’s C:

And click on “Extend Partition“.

If there is no Unallocated space then the free space will be taken from other partitions.

Set the amount of free space to take to the maximum in case you had Unallocated space.

If you don’t have Unallocated space select the partition you want to take free space from, then select how much free space you want to take. The other partition should have some free space for this to work.

Click “OK“.

Don’t worry, changes will not happen immediately, you have to confirm your changes and this is what i like about this program. You can basically do multiple changes and apply them at the end.

Finally click on “Apply” to write changes to your hard disk.

Click “Yes” after you close all other applications.

The process will take some time especially if you are taking space from another partition and not using the unallocated space.

After changes are successful, you should see a success message like this one.

There you have it!

You have just learned how to resize/extend your system partition in Windows 10 using Disk Management and the Partition Wizard free tool.

If you have any questions feel free to leave a comment down below.