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[New] How to Add Unallocated Space to C Drive in Windows 10

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Brithny updated on Feb 25, 2021 Partition Master | How-to Articles

Can I Move Unallocated Disk Space to C Drive in Windows 10

I partitioned my laptop disk into two partitions, partition C, and partition D when I bought it two years ago. The C drive is only 10 GB and D drive is 65 GB. Now I find that the system drive is too small to perform well. So I want to shrink D drive to create some unallocated space, and then I can extend C drive with unallocated space. However, I have no idea how to merge unallocated space into C drive. I am using Windows 10. Any suggestions will be appreciated!

Merge unallocated space to system partition in Windows 10 is an easy and efficient solution when C drive is full problem happens. Have you ever encountered such a situation? Don’t worry! This page will talk about how to merge unallocated space to C drive to increase system partition space with a third-party Windows 10 partition magic tool. Read it and you can find a step-by-step guide about how to do the job. 

How to Add/Move Unallocated Space to C Drive in Windows 10 [Easy]

Usually, you can easily add unallocated space to C drive by Disk Management in Windows 10 to extend system partition if the unallocated space is right behind it. Otherwise, you might need a third-party Windows 10 partition tool to help you do the job. EaseUS partition software is a reliable one. It could be much easier to move unallocated disk space to C drive in all Windows OS with the help of this program. 

Here are two functions of EaseUS Partition Master to extend C drive space: 

If your C drive doesn't have enough space to allocate, you can use Allocate Space in EaseUS Partition Master to add disk space from other drives to C drive.

It has no requirements for the location (right side/ left side/ end of the drive). 

Learn how to add and move unallocated space to C drive in Windows 10:

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

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.

choose another drive to allocate space

3. If there is no or not enough unallocated space on your disk, use the advanced partition resizing function to directly allocate free space from other partitions to the target drive without deleting or formatting.

Find the "Allocate XX space from" option, then click "Select partition". Choose the partition from which you want to allocate space. Drag the partition panel rightward or leftward to resize the partition you want to extend. Then click "OK" to confirm.

choose another drive to allocate space

Step 3. Execute Operations to Extend Partition

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

finish extending partition

Video Tutorial - How to Move Unallocated Space to C Drive on Windows 10/8/7

Before reading the tutorial, you can watch the video and start with 1:11 to learn how to add unallocated space to extend c drive.

How to Add Unallocated Space to C Drive with Disk Management

In any case, the unallocated space is not on the right behind the C drive. You can not add it to the hard drive because the Extend Volume is greyed out. If your unallocated space is adjacent to C drive, you can get Disk Management to move unallocated space in Windows 10.

First, you need to open Disk Management by pressing Windows + X and enter the interface. Then Disk Management has appeared, right-click the C drive, and choose the Extend Volume to extend the C drive with the unallocated space.

disk management extend volume

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