How to Add Space to C Drive to Increase C Drive Space

Daisy updated on Dec 09, 2019 to Partition Master | How-to Articles

Solution 1. Add Space to C Drive with EaseUS Partition Master
Solution 2. Add Space to C Drive with Disk Management in Windows 10
Solution 3. Add Space to C Drive with a Command Line

Why Do You Need to Add Space to C drive

Case 1. "I have an 18GB disk drive that has been split into partitions: C: and D:. C: has about 4GB and D: has about 14GB. However, my C: drive is running out of space. How can I add space to C drive from D?"

Case 2. "I am running windows 2000 server, the C: Drive is only a 4 GB partition and 60GB on its D: Drive. How can I increase C drive space so I can do Windows updates and install a program?"

Case 3. "Well when I reformatted my computer I ended up making 2 partitions. I realized how useless the second one was so I deleted it. How can I now add space to C drive?"

There are many similar cases. Low disk space is one of the issues that many users may encounter. After long time usage of your computer, it pops up a warning message says "Low Disk Space – You are running out of disk space on the system (C:) To free space on this drive by deleting old or unnecessary files, click here..." 

c drive is out of space

Your system partition doesn't have enough free space. And you need to increase your C drive space. If you are in a hurry, here's quick access to adding space to C drive to increase C drive size: 

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 Windows 10 is supported

Is It Possible to Increase C Drive Space

Yes, it is. You can increase C drive space. There are basically two major directions. One is to extend C drive Windows 10, and the other is to free up C drive space Windows 10. The ideal solution is adding space to C drive to increase C drive space because cleaning up space may cause data loss. You can add more space to existing primary partitions and logical drives by extending them into adjacent unallocated or free space on the same disk. Usually, there are three ways to add space to the C drive in Windows 10, 8, and 7. You can use EaseUS Partition Master, try Windows Disk Management or use a command line.

Three Ways to Add Space to C Drive to Increase C Drive Space 

To completely solve the low disk space problem, we should allocate free space to C drive from unallocated space or other partitions. Here are three ways to add more space to the C drive.

Solution 1. Add Space to C Drive with EaseUS Partition Master

For average users who know little about Disk Management, how to add space to C drive is not an easy task. It is true that Windows built-in Disk Management tool can add space to C drive. But the precondition is that there must be continuous space behind C drive. Otherwise, you cannot increase C drive space with it, like Windows Vista, Windows 2008 or Windows 7 Disk Management cannot move the partition to let continuous space behind the C drive which you want to extend. The good news is there is a simpler way. You can use third-party software to add space to C drive.

EaseUS partition software is the perfect specialist partition manager to help you move space to your C drive in Windows 10, 8, and 7. Here is a step-by-step guide on how to use it:

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 Windows 10 is supported

Step 1. Locate the Target Partition

To start extending partition, you should first launch EaseUS Partition Master and locate the target partition which you would like to extend.

Step 2. Extend the Target Partition

If there is unallocated space left on your disk, use the Resize/Move feature to extend partition with the following tips:

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

Select target partition to extend

2. 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.

Extend target partition with unallocated space

If there is no unallocated space on your disk, use the Allocate Space feature to extend the desired partition with the below tips:

1. Right-click on a partition with enough free space and select "Allocate Space" so as to allocate the free space to the target partition.

Select partition to allocate space

2. Select the target partition that you need to extend. And drag the partition panel rightward or leftward so as to add space allocated from the source partition to the target one. Then click "OK" to confirm.

Allocate space to extend partition

Step 3. Execute Operations to Extend Partition

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

finish extending partition

Solution 2. Add Space to C Drive with Disk Management in Windows 10

You can also increase space in C drive using Disk Management. Only if there is unallocated space very behind C drive, can it be increased Disk Management? Otherwise, the C drive's extend volume option will be greyed out. 

Step 1. Right-click "This PC" and go to "Manage > Storage > Disk Management".

Step 2. Select the disk you want to extend, right-click it and click "Extend Volume".

extend c drive spcae with disk management

If you don't have unallocated space, choose the partition that is next to C drive and select "Shrink Volume" to create some free disk space. Then, select the disk you want to extend, right-click and choose Extend Volume to increase disk space.

Solution 3. Add Space to C Drive with a Command Line

If you are familiar with command lines, you can add space to C drive with a command line. Follow the steps below:

Step 1. Open a Command Prompt and type diskpart.

Step 2. At the Diskpart prompt, type the following commands:

Click to copy

  1. List volume: Displays a list of basic and dynamic volumes on all disks.
  2. Select volume: This selects the basic volume number that you want to extend into contiguous, empty space on the same disk.
  3. Extend: This extends the selected volume by size in megabytes (MB).

To Sum Up

Disk Management can help us extend system C drive in seconds. However, the disadvantage is that you have to format other drives to allocate free space from one partition to another. The command line also has the same limitation. So, the best way to add space to C drive is by using EaseUS Partition Master. This software makes it effortless to partition hard drives and take full advantage of your disk space. Besides the partition manager, EaseUS Partition Master provides partition recovery and disk or partition copy features.


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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.