How to Increase C Drive Space?

Jean updated on Nov 29, 2018 to Partition Master | How-to Articles

As applications continue to be installed into the Windows system, one day you may find the system partition (C: drive) does not have enough free disk space, and whenever the system starts, Windows always displays the low disk space warning as: "You are running out of disk space on Local Disk (C:). To free space on this drive by deleting old or unnecessary files, click here..."

Low disk space

In this case, we have to delete the old or unnecessary files to get more free space to ensure the normal operations of the Windows system. However, deleting files is not the best way, because actually it does not work and you will find c drive full again soon. Here below we'll show you three effective free methods to merge partitions to get more space on C drive space with ease:

1. Free increase C drive space in Windows 10/8/7 with EaseUS partition manager software
2. Free extend C partition with Windows built-in Disk Management tool
3. Free increase system partition C drive space with CMD

You can selectively follow one offered method to extend system C drive space with ease now. And if you are not quite familiar with computer management jobs, Method 1 shall be your best choice.

Method 1. How to Increase C Drive Space in Windows 10/8/7 with EaseUS Partition Software

EaseUS partition manager software - EaseUS Partition Master Free supports to free manage partition, increase partition size including to increase space in C drive or other basic management jobs. You can directly download the free partition manager and follow these below-offered steps to extend C drive in Windows 7/8/10 with ease now.

Download Now

 Windows 10 is supported

You can follow the tutorial video to see how to increase C drive partition with the help of EaseUS Partition Master.

If you prefer to detail and the step-by-step guide to increasing C drive space in Windows 10/8/7, follow below steps to do the job now:


Step 1: Launch EaseUS Partition Master

Run EaseUS Partition Master

Step 2: Add space to the System C drive

1. Shrink partition and leave unallocated space for extending C: drive:

  1. Right-click on a partition next to the C: drive and select "Resize/Move".
  2. Drag the end of the partition that is next to the C: drive and shrink it, leaving unallocated space next to the system C: drive, and click "OK".

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

Extend System partition

To add space to the C: drive, drag the system partition end into the unallocated space.

Add space to C drive

Step 3: Confirm to extend system C drive

Click the "Execute Operation" button, it will list the pending operations, and click "Apply" to execute the changes and extend the C drive.

Confirm to extend system C drive

Method 2. How to Free Extend C Partition with Windows Built-in Disk Management Tool

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

2. Select the adjacent disk of the disk you want to extend, right click and choose Shrink Volume to create some free disk space.

3. Select the disk you want to extend, right click and choose Extend Volume to increase disk space.

However, Windows built-in Disk Management utility has some limitations in increasing disk space. First, only Windows Vista, Windows 2008, Windows 7 and Windows 10 Disk Management can shrink and extend system volume. And second, there must be contiguous unallocated space behind the partition that you want to extend. Otherwise, you have to delete the partition behind it or increase disk space with third-party partition manager software such as EaseUS Partition Master Free.

Method 3. Free Increase System Partition C Drive Space with CMD

The third recommended the free method to increase system partition C drive space is to run CMD command. You shall be very careful with this process.

  • Input "Diskpart" in the Search Bar, and click "OK" to enter the Diskpart utility.

If there is contiguous unallocated space behind system drive, you can follow below steps:

  • Input "list disk" command, and press "Enter". Then, all of the disks will be listed.
  • Input "select disk x" command to select the target disk, and then press "Enter".
  • Input "list partition" and press "Enter". Then, all the partitions will be listed.
  • Select the partition needs to be extended by inputting "select partition x" and pressing "Enter".
  • Input "Extend" command, and press "Enter".
  • Input "Exit" to leave the Diskpart window.

If here is no unallocated space right behind system volume, follw below sptes to you have to delete the adjacent drive to get an unallocated space by inputting the commands: 
"list disk" + hit Enter > "select disk x" > "list partition" + hit Enter > "select partition y" + hit Enter > "delete partition" + hit Enter > "select partition x" + hit Enter > "extend" + hit Enter > "exit".

Experiences to Increase C Drive Space:

1. Windows Disk Management cannot move partitions from one location to another, which is one of its disadvantages. But EaseUS Partition Master can move partitions and even support to extend C drive in Windows 10 with simple operations.

2. On the dynamic disk of Windows 2000/XP/2003/2008/Vista and Windows 7/8, it is possible to extend the dynamic volume with another disk space by using "Spanned Volume" function. But this feature does not support to increase system partition (C: drive) size while EaseUS Partition Master can resize dynamic disk directly.


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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.

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