Why need to move unallocated space to C drive in Windows 10?
Unallocated space is blank disk space and does not belong to any partition, with which users can create a new volume or extend another partition. In most cases, users may want to extend another partition, especially the C drive, with the unallocated space. Why? That's mainly because the C drive is the partition where the operating system is installed, and many programs are installed by default. With daily use, many temporary files or caches are generated, too. Then the C drive is easy to get full and shows a red bar in Windows File Explorer. What's worse, users will receive a low disk space warning now and then. In this case, allocating the unallocated space to the C drive and making it larger is of great necessity.
3 Ways to move unallocated space to drive C in Windows PC
Here we provide you with 3 different methods to extend the c drive in windows 10 with unallocated space (also work for Windows 11, 8, and 7).
Method 1: Windows Disk Management
Microsoft has kept the Windows Disk Management tool in Windows 10/11 which users can use to add their unallocated space to the C drive.
Step 1. Press the Windows key + R at the same time to open Disk Management through the Run window.
Step 2. Enter ‘diskmgmt.msc’ and click ‘OK’.
Step 3. Once Disk Management has loaded, right-click on the C drive, and select the "Extend Volume" option to extend the C drive with the unallocated space.
However, some users find the "Extend Volume" greyed out and the process cannot go smoothly.
For example, when you can get unallocated space by shrinking D drive with Disk Management, but when you try to allocate unallocated space into C drive, you'll encounter the mentioned problem. That's because the unallocated space is not adjacent to the C drive, or the unallocated space is not on the righthand side. The Disk Management can only extend a partition with an adjacent unallocated space on its right side.
Fortunately, there are two other ways for you to move unallocated space to C drive.
Method 2: The ‘Move Partition’ tool in AOMEI Partition Assistant
The good news is that if Disk Management doesn’t work for you since the unallocated space and the C drive are not adjacent, you can turn to AOMEI Partition Assistant Professional Edition. This perfect specialist partition manager provides the "Move Partition", which can help move unallocated space next to C drive and then combine them into one. You can download the demo version and have a try first of all.
Step 1. Install and launch AOMEI Partition Assistant. You will now be able to see that the unallocated space is not adjacent to your C drive (which prevented you from using Disk Management). Right-click on the D drive and select ‘Move Partition’ from the menu.
Step 2. In the window, you should drag the D drive towards the righthand side as shown in the illustration below and click OK. This will allow you to move the unallocated space to the C drive.
Step 3. You will now find that the unallocated space is adjacent to the C drive. Next, you can right-click the C drive and select ‘Resize Partition’ to add the unallocated space to your system partition.
Step 4. In the window, you should drag the C drive towards the righthand side to increase the drive size with the unallocated space. Next, click OK and you will return to the main window.
Step 5. Finally, click on Apply in the top left-hand corner of the window to submit the pending operations.
- If the unallocated space is on the left-hand side of the C drive, you can also use the Resize Partition function to add the unallocated space to the C drive.
Method 3: Directly merge the unallocated space to C drive
If you think that method 2 is a bit complicated, then you may prefer method 3 as it uses a simpler process to move the unallocated space to the C drive.
Step 1. 1. Install and launch AOMEI Partition Assistant. Next, right-click on the C drive and select ‘Merge Partitions’ from the menu.
Step 2. 2. In the popup window you should select the partitions you want to merge and click OK. This will allow you to merge the partitions directly with the C drive without having to worry about where the unallocated space is located.
Step 3. Back in the main window, you will be able to preview the new C drive size. You will need to click on Apply in order to complete the merger of the partitions.
In this article, we share you with 3 methods to help move unallocated space to C drive in Windows 11, 10, 8, and 7. You can choose one according to your specific situation. Apart from the above functions, the AOMEI Partition Assistant Professional Edition also comes with many other amazing features such as moving applications from one drive to another (it can help free up drive space), migrating OS to SSD, converting MBR and GPT without losing data, test SSD or HDD speed, etc. If you are using the Windows Server system, you can turn to AOMEI Partition Assistant Server .