EaseUS Partition Master

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How to Increase Space in C Drive on Windows 10/8/7 Without Losing Data or Formatting

Updated by Daisy on May 19, 2021

"How to increase space in C drive without deleting data? Recently, a 'low disk space' pop-out balloon keeps appearing in the Systray, warning me to extend C drive space. I can neither format the C drive nor delete other partitions as I have data saved on all the partitions. So how can I possibly increase C drive space without formatting or deleting partitions?"

On the Windows computer, the running speed of an operating system largely depends on the available free space in C drive. However, with the increasing number of installed software and its corresponding data storage on C drive, your system partition will run out of space, and your computer will have worse performance.

los disk space on Windows 10

Usually, over 90% of users want to extend C drive space because the free space approached the threshold of 200MB, 80MB, and 50MB. You may have tried to delete the unnecessary files, uninstall programs, or clean up the recycle bin to get some spare room in the C drive. But these are only temporary fixes. It won't be long before your C drive is full again. Then, how to increase space in C drive and completely solve the C drive low disk space problem? Read this tutorial in-depth. 

How to Increase Space in C Drive Windows 10 by Resizing Partition

To increase C drive space to speed up Windows 10, three solutions are practical: using EaseUS Partition Master, Windows Disk Management, and Command Prompt.

1. Increase C Drive Space Without Losing Data via EaseUS Partition Master

Being one of the most intelligent disk/partition management software, EaseUS Partition Master can extend C drive space in two ways.

  • First, if you have unallocated space on the same hard disk as the C drive, you can opt for the "Resize/Move" feature to merge the free unallocated space with the C drive.
  • Second, it doesn't matter even you don't have any unallocated space. You can simply use the "Allocate Space" to allocate some space from those non-system partitions to the system C drive without causing damage to saved data on your PC.
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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. 

Except for resizing partition, EaseUS Partition Master provides more one-stop disk partition features. For example, you can clone disk, merge adjacent and non-adjacent partitions, create/delete/format partition, wipe data, and convert disk/partition conversion (e.g., convert MBR to GPT).

2. Extend C Drive Space in Disk Management by Deleting Partition

Disk Management comes with Windows and has many functions to manage disks, including extend volume, shrink volume, format partition, delete partition, etc.. You can use the "Extend Volume" option for increasing C drive space if you don't want to use the third-party EaseUS Partition Master to extend C drive.

Yet, there is a condition when extending C drive via Disk Management; that is, there needs to be some unallocated space very behind the C drive. Otherwise, the extend volume will be greyed out.

If there is no unallocated space, how to increase the space in C drive? We should first create unallocated space by deleting partitions and make sure it locates right behind C drive. Then, extend C drive with the unallocated space. Do it by following the guides below.

Next, we will show an example of how to increase C drive space by removing D drive, which is very behind C.

Step 1. Open Disk Management, right-click partition D, and choose "Delete Volume". When the process finishes, we can see there is unallocated space and locates right behind C drive.

delete D drive to increase C drive size

1. Deleting a partition will lead to data loss. Make sure you have backed up the crucial data on the partition or moved files to another safe place.
2. If the unallocated space is not enough, you can continue to delete the next partition to create more unallocated space.

Step 2.Now, right-click on C drive and select "Extend Volume". Extend Volume Wizard will pop up. Follow the on-screen guide to complete increasing C drive.

extend C drive in disk management

3. Increase Space in C Drive Using Command Prompt

If you are a computer expert, you can use the command lines to extend C drive. Otherwise, be careful to run these commands to make sure you can move more space to C drive without any extra issue, or use the automatic EaseUS partition manager to help you out.

If there are any misoperations that result in data loss, remember to immediately use data recovery software to help you get back files.

If there is an adjacent unallocated space behind the system C drive, you can follow the steps below: 

Step 1. Type diskpart in the Search Bar and hit enter.

Step 2. Input these commands orderly, and press Enter after each command line.

list disk
select disk n (n is the disk letter of your system hard disk)
list partition
select partition n (n is the drive letter of the system drive)

If there is no unallocated space right behind the system C: drive, follow the below steps:

Step 1. Type diskpart in the Search Bar and hit enter.

Step 2. Input the following commands one by one and press Enter after each command line.

list disk
select disk n
list partition
select partition n (n is the drive letter of the partition behind C drive)
delete partition
select partition m(m is the drive letter of system partition)

More Useful Methods on How to Increase Space in C Drive 

In addition to moving space from another drive to C drive to increase the size of C drive, you can free up space in C drive by performing system clean up regularly and transferring installed programs to another drive. Furthermore, you may also upgrade the system disk to a bigger HDD or SSD to solve the low disk space and slow running problems thoroughly.

1. Run System Cleanup to Increase C Drive Space

Useless junk files, outdated system data,  temporary files, cache data, etc., all these files will take huge space on C drive. EaseUS CleanGenius enables you to clear these junk files on C drive quickly within a few clicks.

Step 1. DOWNLOAD and install EaseUS CleanGenius. On EaseUS CleanGinus, click "Cleanup" and click "Scan" to start cleaning up the system and make your PC as good as new.

system cleanup step 1

Step 2. The software will scanning all over your computer to find idle data files that take a huge amount of disk space, you can select useless large files, system junk files and Windows invalid entries and click "Clean" to start system cleanup process.

system cleanup step 2

Step 3. When the scan is complete, click "Done" to finish cleaning system junk files.

system cleanup step 3

2. Move or Delete Large Files to Increase Space in C Drive 

You can check the C partition, manually copy and paste saved big files on the C drive to other secure free partitions. 

You can follow the below steps to locate and move the saved big files to other partition:

Step 1. Press "Windows + I" to open Windows Settings, click on "System" and " Storage".

Step 2. Under "Storage",  select the C: drive to analyze. (Note that the "This PC" drive is the main computer's hard drive where Windows 10 is installed.)

Check C drive storage.

Step 3. Click the Item name such as "Documents", Desktop, Apps & games, etc. to locate the saved big files. Click "View" to check and copy the specific saved big files on C drive.

Locate saved big files.

Step 4. Move these files to another non-system partition by "Copy & Paste". Then delete the original useless files on C drive.

3. Transfer Installed Programs from C Drive to Another Drive

As you know, installed programs and software will also eat up much space on the C drive. Professional PC transfer software such as EaseUS Todo PCTrans will effectively migrate your installed programs to another drive without reinstallation. 

Follow this link to learn how to transfer programs from C drive to D drive to free up space in C drive.

4. Upgrade System Disk and Migrate OS to HDD/SSD

When the system disk gets old after using it for a very long period, the C drive will get full, and the computer performance will slow down. To resolve this issue, the best way is to upgrade and replace the system disk with a bigger new hard drive.

EaseUS Partition Master enables you to effectively upgrade system disk and migrate OS to HDD or SSD by cloning disk. By doing so, you'll be able to move everything, including Windows OS, saved data, installed programs to the new hard drive at one time without worrying about any startup issues. Also, you'll be able to get more free space for C drive.

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Note: The operation of migrating OS to SSD or HDD will delete and remove existing partitions and data on your target disk when there is not enough unallocated space on the target disk. If you saved important data there, back up them to an external hard drive in advance.

Step 1. Select "Migrate OS" from the top menu. Select the SSD or HDD as the destination disk and click "Next".

select migrate os

Step 2. Click "Continue" after check warning message. The data and partitions on the target disk will be deleted. Make sure that you've backed up important data in advance. If not, do it now.

select the destination disk

Step 3. Preview the layout of your target disk. You can also click the disk layout options to customize the layout of your target disk as you want. Then click "Proceed" to start migrating your OS to a new disk

preview the lay out

How to Increase C Drive Space Summary 

This page covers all the effective solutions to increase C drive space in Windows 10/8/7. To optimize your hard disk and partition to enhance computer performance, we highly recommend you equip your computer with EaseUS Partition Master.

With this partition management tool, you can take full advantage of your disk space without effort by resizing, merging, creating, formatting, deleting, cloning, migrating, and converting partitions.

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How to Increase Space in C Drive FAQs

We have covered many ways to increase space in C drive above. If you also have any of the following questions, check the brief answers. 

How do I make my C drive bigger?

If there is no important data on anther partitions, you can delete the partition behind the C drive to make unallocated space to extend C drive in Disk Management:

Step 1. Press Windows + R to open Run, type diskmgmt.msc and press Enter to open Disk Management.

Step 2. Right-click D drive and select "Delete Volume", then it will be changed to Unallocated space.

Step 3. Right-click C drive and select "Extend Volume".

Step 4. Click "Next" and follow Extend Volume Wizard to increase C drive.

How do I increase the size of my C drive in Windows 10?

The simplest ways to increase the size of C drive in Windows 10 is using EaseUS Partition Master to move space from D drive to C drive:

Step 1. Right-click on the D partition with enough free space and select "Allocate Space" to allocate the free space to the C drive.

Step 2. Select the C drive that you need to extend. Drag the partition panel rightward to add space allocated from the source partition to the target one. Then click "OK" to confirm.

Step 3. Click the "Execute Operation" button and click "Apply" to start the process of moving free space from D drive to C drive.

How can I increase C drive space without formatting?

You can increase C drive space without formatting with the Resize/Move function of EaseUS partition management software:

Step 1. Download and launch EaseUS Partition Master.

Step 2. Right-click on the target partition which you would like to extend and select "Resize/Move".

Step 3. Drag the partition panel rightward or leftward to add unallocated space into your current partition and click "OK" to confirm. You may also use the Partition size option to adjust and extend the target partition.

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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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  • 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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  • It won't hot image your drives or align them, but since it's coupled with a partition manager, it allows you do perform many tasks at once, instead of just cloning drives. You can move partitions around, resize them, defragment, and more, along with the other tools you'd expect from a cloning tool.

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

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