How to Transfer Free Space from One Drive to Another in Windows 10 And 11

How to transfer space from one drive to another in Windows 10? This page offer some effective ways to extend drive space easily and provide a step-by-step guide.


By Dervish / Updated on February 11, 2024

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Why transfer free space from one drive to another?

Transferring free space from one drive to another can serve several purposes:

✦ Optimizing Storage Allocation: If one drive has a surplus of free space while another received low disk space warning, reallocating some of the unused space can help balance storage resources more effectively.

✦ Consolidating Data: It allows you to consolidate data on a single drive, making it more organized and easier to manage. This is particularly useful when dealing with large files or media libraries.

✦ Improving Performance: By moving data from a nearly full drive to one with more free space, you can help prevent performance issues that can occur when a drive is close to capacity.

✦ Preparing for Backup or Migration: When you're planning to back up or migrate data from one drive to another, having sufficient free space on the destination drive is essential.

✦ Avoiding Fragmentation: Drives tend to perform better when they have more free space, as it reduces the likelihood of file fragmentation.

Remember, whenever you're dealing with data and storage management, it's crucial to back up important files before making any significant changes to avoid potential data loss.

How to transfer space from one drive to another in Windows 10

Technically, there are several solutions to fix this issue since the theory is to increase one drive space by reducing another drive. To change the unreasonable partition layout, one can resize partition using Diskpart, the built-in tool of Windows. However, this is a roundabout way because no matter to shrink or extend partition, the unallocated space won’t be the location that you want it to be.


Disk Management is also a great tool in managing hard drive and its partitions. It has a graphical user-interface that is suitable for user who has limited computer knowledge. If there is unallocated space adjacent to the partition you want to increase, just right-click the partition and select “Extend Volume”. When "Extend Volume grayed out", you can delete the contiguous partition to make it as unallocated and then repeat above steps.


How to transfer space from D to C Windows 10 via professional manager

Although Windows brings excellent built-in tools, some users just wonder if there is a way out that allows us to allocated free space from one partition to another easily and safely?

Fortunately, the answer is positive. AOMEI Partition Assistant Professional provides a feature named “Allocate Free Space” can help us transfer free disk space from one drive to another directly. For example, move space from D to C drive with a few clicks on Windows 11/10/8/7.

Download Demo Win 11/10/8.1/8/7/XP
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1. Install and launch AOMEI Partition Assistant on the computer. Right-click the partition you want to allocate from (partition D with free space) and select “Allocate Free Space”.

Allocate Free Space

2. In the pop-up window, it gives you option to specify the space size and destination partition. Select C drive from the given list.

Allocate From D To C

3. Here is a virtual outcome. Click “Apply” > “Proceed” to make it real.

Apply Allocate Free Space

Since the system drive is involved, a restart is required.
This applies to different partitions on the same physical hard drive.
To perform this task in Windows Server, you can turn to the Server edition.


Actually, when it comes to how to transfer space from one drive to another in Windows 10 or Windows 7, many countermeasures are workable. Nevertheless, to find out the easiest workaround and reduce the risk of losing data during the process is not that easy.

AOMEI Partition Assistant is capable of solving many other issues as well. For example, it is a Lexar USB drive format tool that can format other brands of USB sticks, too. If you installed SSD and want to move Windows 10 to new SSD, this software can do you a big favor in migrating OS to SSD and keeping files on HDD.

Dervish · Staff Editor
Dervish is an English editor of AOMEI Technology; He is delicated to offering users easy and effecitve solutions for issuses related to disks and partitoins. In his spare time, he enjoy wathcning films, playing footable, traveling and so on.