How to Make C Drive Bigger in Windows 7/10

Daisy updated on Dec 11, 2018 to Partition Master | How-to Articles

"Can I spare some disk storage from D to C drive partition to make C drive bigger? My laptop used to run Windows 7, and lately, I upgraded Windows 7 to Windows 10. Everything is fine with the new operating system except that the system drive becomes stuffed. However, a considerate amount of space is available to use in other partitions. I'm thinking to allocate the unused space to C. Is it possible to do that?"

When upgraded your previous Windows to Windows 10, it's common to see that C drive (your system partition) runs out of space, because system data, files, and folders from the old Windows OS and the new are all concluded in the drive, making Windows 10 rollback in one month possible.

Once C drive is full, your computer performance starts lagging. In such a case, each time it takes a little longer to boot up the machine, launch and run a program, play a game, etc. To fix the "insufficient C drive space" issue, you'd better do a reallocation of space of the hard drive instead of replacing the drive by a larger one.

How to Enlarge C Drive Partition by Taking Space from Others

Here are two typical free solutions people usually take to increase C drive space. On both Windows 7 and Windows 10 computer, you can use a program called Disk Management, where you can access by right-clicking "Computer" and then go to "Manage". On the left side of the opened window, you can find "Disk Management" under "Storage".

But most of the time, 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

To simplify the system partition resizing process, you can use a third-party free partition manager. EaseUS Partition Master Free is the highly recommended one. Just download and install the hard disk management utility on your Windows 7 or Windows 10 computer, you can freely create more space for the C drive in short of disk capacity.

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 Windows 10 is supported

How to Use EaseUS Partition Master Free to Increase C Drive Space:


Step 1: Launch EaseUS Partition Master

Run EaseUS Partition Master

Step 2: Increase C drive space

1. Shrink partition to free up unallocated space:

Right-click on a partition next to the C: drive and select "Resize/Move".
Drag either end of the partition to shrink and leave unallocated space behind the system C: drive and click "OK".

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

Extend System partition

3. Drag the system partition end into unallocated space so to add space to C: drive.

Add space to C drive

Step 3: Keep all changes to extend C: drive

Click the "Execute Operation" and click "Apply" to keep all changes so to extend the system C: drive.

Confirm to extend system C drive

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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

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