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[100% Working] How to Increase C Drive in Windows 10/8/7 Without Formatting

Updated by Daisy on Mar 23, 2021
Written by Tracy King

From Microsoft Community: "Can anyone help? I want to extend the volume space in OS installed drive, but the Extend volume option is not appearing. For other drives, it's working perfectly. How to extend C drive space in Windows 10 without formatting?"

Can I Increase C Drive Space Without Formatting in Windows 10/8/7

According to the Windows forum and the Google searching result, it seems that quite a lot of users are feeling reluctant to format or delete their second or third partition to free up space for extending system C drive. 

So if there is a guide on how to increase C drive space in Windows 10 without formatting or how to extend C drive space in Windows 10 without formatting or deleting in Windows 10/8/7, things will be perfect. Here in the below, we'll show you how to increase and extend the C drive in Windows 10/8/7 without formatting.

How to Increase C Drive Space in Windows 10 Without Formatting

Disk Management and CMD command line all require to format and delete the partition so as to add space to the system C drive. If this is not what you want, don't worry. Professional partition manager software - EaseUS Partition Master will help.

# 1. Download Partition Manager Software for Help

It allows you to effortlessly extend C drive without deleting or formatting other partitions. You can even apply it to extend the system reserved partition for Windows 10 updates or fix other more partition problems.

Just download this software, install it, and apply it with the guidelines below to start extending your C drive now:

# 2. Extend, Increase C drive in Windows 10/8/7 without Formatting/Deleting Partition

It's a piece of cake to extend C drive without formatting. Select C drive and follow the on-screen steps to extend C drive in Windows 10 without formatting.

Step 1. Locate the Target Partition

To start extending partition, you should first locate the target partition and select "Resize/Move".

Select target partition to extend

Step 2. Extend the Target Partition

Drag the partition panel rightward or leftward to add unallocated space into your current partition and click "OK" to confirm.

choose another drive to allocate space

Extra Option: Get Space from Another Drive

If there is not enough unallocated space on your disk, right-click on a big partition with enough free space, select "Allocate space ".

Then select the target partition that you want to extend at the allocate space to column.

choose another drive to allocate space

Step 3. Execute Operations to Extend Partition.

Drag the dots of the target partition into the unallocated space and click "OK".

finish extending partition

Then Click the "Execute Operation" button and click "Apply" to keep all the changes. 

# 3. Video Tutorial to Extend C Drive Without Formatting

In this video, you are going to learn three ways to resize and extend C drive space in Windows 10/8.1/8/7. There are three cases:

  1. Case 1. C drive and D drive are two adjacent partitions on the same disk
  2. Case 2. There is unallocated space on the disk
  3. Case 3. There isn't unallocated space. C drive and F drive are non-adjacent partitions.

Watch this video to extend C drive accordingly.

After this, you can reboot your computer to keep all changes on your Windows 10, 8, or 7 PC. Now that, you've successfully increased C drive and gotten more free space added to your system drive.

How to Increase C Drive Space in Windows 10 Without Formatting FAQs

EaseUS Partition Master provides you with the easiest way to increase C drive space in Windows 7, Windows 8, and Windows 10 without formatting or deleting partitions. The following topics are highly relevant to how to extend C drive space in Windows 7/10, check them if you are interested.

Can C Drive be extended?

You can increase C drive space by extending the C drive and adding free disk space to the system partition or moving free space from other partitions to the C drive. Extending C drive space in Windows 7/8/10 is a common operation and it does not cause data loss.

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How can I increase C drive space in Windows 7?

How to extend C drive space in Windows 7 without formatting? Or how to increase C drive space in Windows 10? 

If there is unallocated space in your disk, you can extend C drive using the unallocated space. If there is no or not enough unallocated space on your disk, use the advanced partition resizing function of EaseUS Partition Master to directly allocate free space from other partitions to the target drive without deleting or formatting.

How do I allocate more space to C drive without formatting?

EaseUS comes with two easy solutions for you to increase C drive space in Windows 7 or Windows 10 without formatting. And, with the advanced partition resizing feature, you can allocate free space from other drives to the C drive by drag and drop.

how to allocate space to C drive

How do I increase the size of my C drive?

How can you extend the C drive space without formatting or deleting? 

When there is unallocated space behind the C drive, you can use the Windows Disk Management utility to increase C drive space:

Step 1. Right-click My Computer and choose "Manage -> Storage -> Disk Management".

Step 2. Right-click on the partition that you want to extend, and choose "Extend Volume" to continue.

Step 3. Set and add more size to your target partition and click "Next" to continue.

Step 4. Click "Finish" to complete the process.

how to extend c drive in windows 10 without formatting

If there is no unallocated space or the unallocated space is not next to the C drive, to extend C drive without formatting or deleting, the professional partition manager - EaseUS Partition Master is your best choice.

With its "Resize/Move" partition functions, you can increase C drive space without data loss effortlessly. Whether the unallocated space is near to C drive, or whether there is unallocated space or not, it can help you extend C drive without formatting easily. 


That's all about increasing C drive space in Windows 10 without formatting. EaseUS disk management tool plays an important role in the process. Besides, it can merge partitions, migrate OS, and convert MBR to GPT without losing data. If you have disk management problems, download this software to get help.

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Updated by Daisy

Daisy is the Senior editor of the writing team for EaseUS. She has been working in EaseUS for over ten years, starting from a technical writer to a team leader of the content group. As a professional author for over 10 years, she writes a lot to help people overcome their tech troubles.

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Written by Tracy King

Tracy joined in EaseUS in 2013 and has been working with EaseUS content team for over 7 years. Being enthusiastic in computing and technology, she writes tech how-to articles and share technical solutions about Windows & Mac data recovery, file/system backup and recovery, partition management and iOS/Android data recovery.

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  • 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. I also think the overall look and feel of EaseUS Partition Master Free makes whatever you're doing with your computer's partitions easy.

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  • Partition Master Free can Resize, Move, Merge, Migrate, and Copy disks or partitions; convert to local, change label, defragment, check and explore partition; and much more. A premium upgrade adds free tech support and the ability to resize dynamic volumes.

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