Merge Unallocated Space to System Partition in Windows 10

Jean updated on Aug 11, 2019 to Partition Master | How-to Articles

Can I Merge Unallocated Space to System Partition in Windows 10

I use a 2TB Seagate hard drive as the internal memory of my computer. I have partitioned the disk into four partitions: C drive is for the OS, D drive is for my applications, and the other two partitions are for my files. But now I find the C drive is running in low disk space while D drive has much-unallocated space. So I was wondering how I can merge unallocated space to the system partition. Is there any way I can do this? My computer runs Windows 10. Please help!

Usually, when you encountered Windows C drive full problem in Windows 10, you can merge unallocated space to system partition to extend C drive. Then the problem will be solved easily. For example, if there is much free space on your D drive, you can shrink it and merge the newly unallocated space into C drive. It is an easy and safe way to increase C drive space. You don’t need to worry that it will let you lose any file paths for the programs on D drive or mess up the Windows 10 OS on the system partition. 

Steps to Merge Unallocated Space to System Partition in Windows 10

Now you might think what tool can you trust to do the task. Here we recommend EaseUS partition software. The program works well to resize a partition. It has helped numerous users deal with disk partitioning job, especially low disk space problem. With its help, moving unallocated space to system partition in Windows 10 should not be a problem.

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 Windows 10 is supported


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

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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.