How to Make C Drive Bigger Windows 7/10| Assigning More Space to C Drive

Daisy updated on Jul 06, 2020 to Partition Master | How-to Articles

To make C drive bigger means to add more space to C drive. There are chances that your C drive is full, almost running out of space, and you must extend C drive space as soon as possible because a filled up C drive has noticeably affected your computer performance. Speaking of how to make C drive bigger, the methods should vary depending on whether there is a 'redundant' partition or unallocated space next to it. For example:

  • if C drive full but D is empty, it's easy to increase C drive by giving D space to C
  • Besides, if C drive full and the D drive has both used space and free space. To utilize this part of free space, you'll have to shrink the D drive space or delete the whole D drive.

The presumption here only mentions the possibility of assigning more space to C drive in the native program in Windows 10/8/7 called Windows Disk Management. However, all the seemingly complicated manner in Disk Management can be processed with the easier and quicker third-party partition manager software - EaseUS Partition Master.

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 Windows 10 is supported

How EaseUS Partition Master Makes Your C Drive Bigger

Compared with Windows Disk Management, there is no limitation in using EaseUS Partition Master to move space from other drives to C drive. 


Resize/Move Partition:

Shrink D drive to get unallocated space, and extend C drive.


Allocate Space to C Drive:

Choose any drive among D, E, or F and allocate free space to C drive.


Merge Two Partitions:

Combine C drive and neighboring D drive together to get one larger C drive.


Merge Non-adjacent Partitions:

Combine C drive with non-continuous E, F, or G drive to get one larger C drive.

How to Make C Drive Bigger in Windows 7/8/10 Disk Management

On Windows computers, you can use a program called Disk Management to resize a partition. You can access Windows Disk Management by right-clicking "My Computer" in Windows 7 or "This PC" in Windows 10 and then go to "Manage". On the left side of the opened window, you can find "Disk Management" under "Storage".

Most of the time when your first opened the Disk Management, there is no way to start. The extend volume option is greyed out in Disk Management if there's no unallocated space (i.e., with no drive letter and file system) available on the drive. For average users, it's hardly possible to make C drive bigger here.

extend volume is greyed out

In this case, to enable the "Extend Volume" function in Disk Management, you need to delete D drive first to create unallocated space next to the C drive. Here's the detailed guide:

Step 1. Right-click D drive and select Delete Volume, then it will be changed to Unallocated space.

Step 2. Right-click C drive and select Extend Volume.

Step 3. Click Next till Finish in the pop-up Extend Volume Wizard window, then Unallocated space will be added into C drive.

How to Make C Drive Bigger in Windows 7/8/10 with EaseUS Partition Master

To simplify the system partition resizing process, you can use the third-party EaseUS partition magic software as recommended in the beginning.

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 Windows 10 is supported

To gain the best experience to get more space for C drive from other drives without previously shrinking or deleting an existing partition, the "Allocate space" feature is the most straightforward and acceptable. You don't need to consider how to get unallocated space in order to resize the C drive space. Instead, simply choose one drive that has enough free space you need and use one-click "Allocate space" to add it to C drive.

For example, to assign more 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.

Select partition to allocate space

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

Allocate space to extend partition

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

finish extending partition

Can You Make A Bigger Disk Drive on Your Own Now?

Regarding the topic "how to make C drive bigger", we introduced two ways, including the inbuilt Windows Disk Management and third-party EaseUS disk & partition management software. Though the native tool provides users with "Shrink Volume" and "Extend Volume" options to either make a drive smaller or bigger, it's hard to comply with the rules that unallocated space must be previously created, and it has to be located on one side of the C drive.

In contrast, the third-party tool looks more intelligent. No matter from which drive you want to borrow free space for the C drive, it's always a one-click job, without causing data loss.

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 Windows 10 is supported

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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.

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