How to Extend or Increase C Drive in Windows 8/8.1

Tracy King updated on Sep 10, 2020 to Partition Master | How-to Articles

Are you having a low space issue in your system C drive on Windows 8/8.1, Windows 7, and even Windows 10 PC? On this page, we'll take Windows 8 as an example to show you how to increase C drive space in Windows 8 without formatting or losing any data. 

Windows 8 low disk space

How Can I Extend C Drive in Windows 8 without Formatting?

"Does anyone know how do I extend my C drive without formatting a partition? I'm using Windows 8 but I don't have unallocated space on my disk. What can I do?"

Some Windows beginners may have the same doubt. There are many ways that can help you extend C drive. But all these methods all require to add unallocated space to your target partition. 

Pick up one of the following Windows 8 disk managers and navigate to the tutorial guidelines to enlarge your C drive for free now:

  1. #1. EaseUS Free Partition Manager - Beginners' Pick
  2. #2. Disk Management - Experienced Users' Pick
  3. #3. DiskPart - Administrators' Choice

Method 1. Extend C Drive in Windows 8 with EaseUS Partition Master

Applies to: All levels of Windows 8/8.1, Windows 7 and Windows 10 users, beginners' best choice.

As a magic Windows 8 disk manager, EaseUS Partition Master Free Edition can extend Windows 8 32-bit and 64-bit system partition safely with simple operations by its "Resize/Move partition" feature. 

Download Now

 Windows 10 is supported

With this free partition software, you can also execute some advanced operations (that Disk Management and DiskPart don't support) on your disk, such as: 

Tutorial: Extend C Drive in Windows 8 With/Without Unallocated Space


Step 1: Launch EaseUS Partition Master

Run EaseUS Partition Master

Step 2: Increase C drive space

1. Shrink partition to free up unallocated space:

Right-click on a partition next to the C: drive and select "Resize/Move".
Drag either end of the partition to shrink and leave unallocated space behind the system C: drive and click "OK".

2. Right-click on C: drive and select "Resize/Move".

Extend System partition

3. Drag the system partition end into unallocated space so to add space to C: drive.

Add space to C drive

Step 3: Keep all changes to extend C: drive

Click the "Execute Operation" and click "Apply" to keep all changes so to extend the system C: drive.

Confirm to extend system C drive

After EaseUS Partition Master executes these operations, you will see the Windows 8 or Windows 8.1 system partition has been extended successfully in Disk Management and File Explorer.

Method 2. Increase C Drive in Windows 8 Using Disk Management

Applies to: Experienced Windows 8/8.1 and Windows 7/10 users.

As a free Windows built-in disk manager, Disk Management is indeed powerful in basic disk managing. Check the list and see what else can Disk Management do for you besides extending volume size:

  • Create, delete and format volume
  • Add or change the drive letter
  • Extend and shrink volume
  • Convert basic disk to dynamic disk
  • Explore, open volume
  • Convert MBR disk to GPTor convert GPT disk to MBR
  • Convert dynamic disk to basic disk by deleting all dynamic volumes in advance.
  • Mark partition as active

You can do the following operations on Windows 8 or Windows 8.1 32 bit or 64 bit with Disk Management to extend the C drive now. Be careful while you are executing the following steps.

Step-by-Step Guide: Increase C Drive Using Disk Management

Step 1. Right-click My Computer, select Manage -> Storage -> Disk Management, open Windows built-in Disk Management.

Step 2. Check if there is an unallocated space next to your C drive. 

If yes, jump to Step 6. If not, follow Step 3 to continue. 

Step 3. Right-click on the partition next to your system C drive and select "Shrink Volume".

Step 4. Input the volume size that you want to shrink and add to C drive, click "OK" to confirm.

There, the unallocated space is now next to your C drive:

Free up unallocated space next to C drive

Step 5. Right-click on C drive and select "Extend Volume".

Increase C drive

Step 6. Set and add the unallocated space to the C drive, and click "OK" to confirm.

After this, you will see that the C drive is now extended without any issues.

Although there are some improvements in Disk Management in Windows 8, it still has many limitations in partition management.

If you need to execute some advanced partition management tasks in Windows 8, such as to merge two partitions, migrate OS to SSD, turn to EaseUS Partition Master are recommended in Part 1 for help. 

Method 3. Extend C Drive in Windows 8 using DiskPart

Applies to: Advanced users like administrators in Windows 8/8.1, Windows 10/7, etc.

Another workaround is using DiskPart to extend system C drive space using Windows DiskPart. It's free yet tricky for beginners. 

Therefore, if you prefer to try, make sure you will follow the steps below very carefully:

Step 1. Type cmd in Search and right-click Command Prompt, select "Run as Administrator".

Step 2. Type diskpart and hit Enter to bring up the DiskPart command window.

Step 3. Type the following command lines and hit Enter each time:

  • list disk
  • select disk 0 (Replace 0 with your system disk number)
  • list volume
  • select volume 2 (replace 2 with the volume number next to your C drive)
  • shrink desired size MB (This command will shrink volume, making unallocated space next to C drive.)

Step 4. Type the following command lines and hit Enter each time to extend C drive:

  • list volume
  • list volume 1 (Replace 1 with the C drive number)
  • extend

extend Windows 8 C drive

Step 5. When the process completes, type exit to close the command window.

After this, you can reboot PC and you'll get an extended C drive on your Windows 8 computer by then.


On this page, we covered three practical Windows 8 disk managers to help you extend or increase C drive for free using EaseUS Partition Master Free, Disk Management or DiskPart.

If you prefer an easy and efficient solution, take EaseUS Partition Master as your best choice. You may also execute some other advanced operations on Windows 8 disk using this tool.

Download Now

 Windows 10 is supported

Was This Page Helpful?


Frequently Asked Questions

Why Choose EaseUS Partition Master?

"I've used Partition Master Professional many times to create, delete, format, move, rename, and resize partitions."PCWorld

"Partitioning tools have come a very long since the days of complicated command line utilities and EASEUS Partition Master is one of the most advanced programs available."TECH ADVISOR

"I love that the changes you make with EaseUS Partition Master Free aren't immediately applied to the disks. It makes it way easier to play out what will happen after you've made all the changes."Lifewire

Will the "Migrate OS" feature transfer the Windows system files only or the whole C drive?

To ensure that the migrated system will boot normally, the Migrate OS feature will transfer all the files in the system and the boot partitions. Generally, the boot partition is the C drive so the transfer will include all the files in C.

Does EaseUS Partition Master license apply to multiple computers?

The license of Partition Master Professional and Server editions can be used on 1 computer only, while that for for the Technician and Unlimited editions can be used on multiple machines.

What is the difference between EaseUS Partition Master Trial version and the Free version?

Free is for home users only, with most basic functions available such as partition resize and clone. While trial can help you understand how this product works and test what a full license can do on a business or server OS machine.

Will it cause any data loss after resizing the partition in EaseUS Partition Master?

Generally, it will not cause any data loss or boot issue by resizing a partition. However, in order to protect your data, we suggest that you backup the partition before resizing, in case of any unexpected situations such as power outages, computer hardware failures, etc. You can use EaseUS Todo Backup to backup the partition and its trial version is fully functioned for 30 days.

What should I prepare before resizing the partition?

On the partition that is going to be operated, there might be some files being occupied by other programs. To ensure a successful operation, we suggest that you close all the unnecessary software before resizing that partition. Otherwise, EaseUS Partition Master will detect the partition being locked by the other software and require a reboot to resize the partition under boot mode.

About EaseUS Partition Master

All-round disk & partition management software for personal and commercial use. Let it manage your storage drive: resize, format, delete, clone, convert, etc.

Video Tutorial

How to Partititon a Hard Drive on Windows 10/8/7