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

Updated by

Linda 

Written by

Linda 

Last updated on April 22, 2024

Yes, you can move unallocated disk space to the C drive in Windows 10. The process involves resizing partitions, and Windows 10 has a built-in tool called "Disk Management" that allows you to do this. Here's a step-by-step guide: 1. **Open Disk Management:** - Press `Win + X` on your keyboard and choose "Disk Management" from the menu. - Alternatively, search for "Create and format hard disk partitions" in the Start menu, and select "Disk Management" from the results. 2. **Identify the Unallocated Space:** In the Disk Management window, look for the unallocated space. It will appear as a black area without a drive letter. 3. **Shrink the Adjacent Partition:** - Right-click on the partition next to the unallocated space (usually D, E, or another drive) and select "Shrink Volume." - Follow the prompts to reduce the size of this partition, creating more unallocated space. 4. **Extend the C Drive:** - After shrinking the adjacent partition, the unallocated space should now be right next to the C drive. - Right-click on the C drive (usually labeled "OS (C:)") and select "Extend Volume." - In the Extend Volume Wizard, follow the steps to add the unallocated space to the C drive. 5. **Confirm Changes:** Click "Finish" to apply the changes. The system will then resize the partitions, and the unallocated space will be merged with the C drive. Please note that this process may take some time, especially if you're working with a large amount of data. Also, ensure you have no important files on the partition you're shrinking, as the operation could potentially cause data loss.

I partitioned my laptop's hard drive into two sections, C and D, when I bought it two years ago. C has only 11/10 GB, while D has 65 GB. Now, I realize the system drive is too small to function properly. Hence, I plan to shrink D to create some unallocated space, which I can then use to extend C. However, I'm unsure how to merge this unallocated space into C. I'm using Windows 11/10. Any advice would be greatly appreciated!

Merging unallocated space into the system partition is a simple and effective way to fix the "C drive full" issue in Windows 11/10. Have you ever encountered this situation? Don't worry! This article will discuss how to use a third-party Windows 11/10 partition magic tool (Partition Magic) to combine unallocated space with the C drive to increase the system partition's capacity. After reading, you'll find a step-by-step guide on how to do it.

How to add/move unallocated space to Drive C in Windows 10 [The Easy Way]

Usually, if the unallocated space is right next to the C drive, you can easily add it to the C drive to expand the system partition using Disk Management in Windows 11/10. Otherwise, you might need a third-party Windows 11/10 partition tool to help you out. is a reliable partition software. With this program, you can more easily move unallocated disk space to the C drive across all Windows operating systems.

Here's an introduction to two tools, Partition Master, and their feature for expanding C drive space:

Your C drive is out of space. -- Allocate space

If you run out of space on your C drive, you can use the "Allocate Space" feature in Partition Assistant to allocate space from other disks to the C drive.

Unallocated space is non-contiguous. -- Resize/Move

It does not matter where (right/left/rear driver).

Learn how to add and move unallocated space to the C drive in Windows 11/10:

Step 1: Locate the target partition.

Head over to the "Disk Management" utility, locate the target partition, and select "Resize/Move Partition".

Select the target partition to expand

Step 2: Expand the target partition

Then, drag the partition panel rightwards or leftwards to add the unallocated space to the current partition, and then click “OK” to confirm.

Get space from another drive

Extra option: Get space from another drive

If there isn't enough unallocated space, right-click a large partition with plenty of room and select “Allocate Space.”

Next, under "Allocate space to," select the partition you want to extend into.

Resize and allocate space from another drive

Step 3: Perform the operation to extend the partition

Just drag the partition you want to move into the unallocated space, and then click "OK".

Next up, just translate this sentence into American English:

Click the "Run Task" button, and then click "Apply" to save all changes.

Video tutorial - How to move unallocated space to the C drive on Windows 11/10/8/7

Before diving into the tutorial, you can learn how to add unallocated space to your extended C drive by watching the video starting from 1:11.

Aside from extending C drive on Windows 10 with unallocated space, Windows 11 users can also use this partition manager - AOMEI Partition Assistant to expand C drive in Windows 11 like a pro.

Also, don't forget to share this tool with your friends and help them manage their disk space wisely:

How to add unallocated space to drive C using Disk Management in American English: 1. Press the Windows key + X on your keyboard and select "Disk Management" from the menu. 2. In the Disk Management window, locate the "C:" drive. It should be listed under "Local Disks." 3. Identify any unallocated space present on your computer. This will appear as a black bar or an area labeled "Unallocated" in the graph below the disk list. 4. Right-click on the unallocated space and choose "Extend Volume." 5. Follow the prompts in the Extend Volume Wizard to add the unallocated space to drive C. Typically, you'll just need to click "Next" until the process is complete, then click "Finish." Remember that you can only extend a volume if the unallocated space is immediately adjacent to it. If not, you might need to resize or delete other partitions to create contiguous unallocated space.

Anyway, the unallocated space is not behind Drive C. You cannot add it to the hard drive because the Extend Volume option is grayed out. If your unallocated space is adjacent to Drive C, you can use Disk Management to move the unallocated space in Windows 10.

First, you need to open Disk Management by pressing Windows + X and entering the interface. Then, Disk Management will appear. Right-click on the C drive and select "Extend Volume" to expand the C drive using the unallocated space.

Next up, we just need the translation in American English for the caption: ""