How to Extend C Drive Space in Windows 10

Like previous versions of Windows, Windows 10 also uses disk partitioning system where OS drive (usually C drive) generally stores all Windows system files and program installation files. Over the time, the space in C drive get’s filled up and you start getting pop-ups for clearing some space. And if you don’t extend C drive space, it may cause your Windows 10 to slow down.

Besides Microsoft Store Apps, Windows updates are also cached and stored in the C drive for recovery purposes. Cleanup tools will help you free up some space but next Windows update will fill it again. In such scenarios, users don’t have many options but to increase the OS drive (C Drive) space. It’s not very easy to extend the space of C drive and there may be complications. So, in this tutorial we are going to explain how to extend C drive space on Windows 10 in details.

SEE ALSO:
1. How to Move Microsoft Store Apps from C Drive to Other Drive?
2. How To Shrink A Volume (Local Disk Drive) In Windows 10?

We will be using two utilities to extend C drive space on Windows 10 – native Windows Disk Management tool and third party software AOMEI Partition Assistant. Let’s start with the native Windows Disk Management tool.

A) Extend C Drive Space on Windows 10 using Disk Management

In the first part of the tutorial, we will use the native Windows Disk Management tool to increase C drive space. Disk Management tool is built in tool for managing disks on Windows 10. Before we start, we suggest you take the backup of your important data. So that you can recover in case of any failures.

NOTE: Using native Disk Management tool, you can only extend C drive space only if the nearest drive is empty or unallocated. It means, you can only use D drive (not drive E, F etc.) space to extend C drive space. So, you can move the data from D drive to other drives to make D drive free. After that you can use D drive space to extend C drive.

Step 1: Open Disk Management Tool

First of all, right-click on Start button and select Disk Management. You can also open Disk Management using RUN utility. Simply type diskmgmt.msc in RUN and press Enter.

Right-click on Start button and select Disk Management
Right-click on Start button and select Disk Management

Step 2: Delete D Drive to Make Unallocated Space

As mentioned earlier, first take the backup of the data on D drive. After you have emptied D drive, right-click on D drive in Disk Management and select Delete Volume. Disk Management will delete the D drive and it will be converted to unallocated space.

Delete D Drive in Disk Management
Delete D Drive in Disk Management

Step 3: Extend C Drive Space using Disk Management

After creating unallocated space, right-click on the C drive partition and select option to Extend Volume.

Right click and Select Extend Volume to Extend C drive Space
Right click and Select Extend Volume

NOTE: If the Extend Volume option is disabled, you won’t be able to extend C drive space using native Disk Management tool. We will have to use a third-party tool which is explained in next section. We suggest you create a new volume using unallocated space before moving forward.


Step 4: Complete the Extend Volume Wizard

After you click Extend Volume, the Extend Volume Wizard will open. Using this wizard, you can merge partial or whole unallocated space with C drive. Simply follow on screen instructions to extend C drive space. And finally click Finish to close the wizard.

Finish the Extend C Drive Volume Wizard
Finish the Extend Volume Wizard

Go to Disk Management and check the C drive space again. You have successfully increased C drive space. It will show up immediately in Disk Management.

C Drive Space Extended
C Drive Space Extended

SEE ALSO: How to Create New Volume using Unallocated Free Space?

B) Extend C Drive Space with AOMEI Partition Assistant

In previous section, we merged D drive with C drive by deleting it. However, if you just want to add space from the partition that is not adjacent to C drive, you can use AOMEI Partition Assistant. It’s a third-party partition manager software with a lot of features. AOMEI Partition Assistant download link is given at the end of the post.

You can also use this method if the native method failed to extend C drive. Specially when the Extend Volume option for C drive is grayed out in Disk Management, you can use AOMEI Partition Assistant.

Step 1: Free Up Space to Extend C Drive

First, we will need to make free space to merge with C drive. You can skip this step if you already have unallocated space.

Now, right-click on the drive with available storage (you can use the volume you created after native method failed) and select Resize/Move Partition.

Right-click the Volume and Select Resize/Move Partition in AOMEI
Right-click the Volume and select Resize/Move Partition

Now use the slider to shrink the partition and free up required space. In this tutorial we have freed 21 GB from 821 GB drive. Click OK to confirm.

Select the amount of Space to Free up to Extend C drive space
Select the amount of Space to Free up

We will use this 21GB to extend C drive space. You can free up more space depending upon your requirements.


Step 2: Merge Free Space with C Drive

Now, we have unallocated space ready to be merged with C drive. Right-click on newly-created unallocated space (which looks like a drive of 21 GB in our case) and select Merge Partitions.

Right-click on Un-allocated Space and Select Merge Partitions in AOMEI Partition Assistant
Right-click on Un-allocated Space and Select Merge Partitions

Next, select both C: drive and the unallocated drive from the list and click OK to merge both partitions.

Merge C Drive with Unallocated Space
Merge C Drive with Unallocated Space

Step 3: Apply the Changes in AOMEI Partition Assistant

After you are done with the changes, click on Apply button in the top left corner. Next, click on Proceed button to apply the changes.

You may also see additional warning about restarting your computer. C Drive extension process may take some time to complete and your computer might reboot several times.

Apply the Changes we made in AOMEI Partition Assistant
Apply the Changes we made in AOMEI Partition Assistant

After extending C drive space successfully, AOMEI will start your PC in normal mode. You can verify disk space in Disk Management or simply by going to This PC.

C Drive Space Extended Successfully
C Drive Space Extended Successfully

Download AOMET Partition Assistant

You can download latest version of AOMEI Partition Assistant from the link below.


Two Easy Methods to Increase C Drive Space

Above tutorial explained two easy methods to extend C drive space. While the native Disk Management method is simple and straightforward, but it may fail due to disabled Extend Volume option. However, in such scenarios, you can always use AOMEI Partition Assistant. AOMEI Partition Assistant offers the facility to merge spaces from non-adjacent partitions which is great.

Hope you found this tutorial helpful. In case you face problems while following the tutorial, write them down in the comments. You can also subscribe to our newsletter to get such tutorials directly into your inbox.

SEE ALSO: 8 Simple Tricks to Speed up your Windows 10 PC.

Editorial Staff

Hi there, we are the editorial staff at HELLPC. We are a team of funny and technical people. Feel free to get in touch with us via Contact-Us page.

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