1 Answer. Your problem is that you have an EFI partition at the end of the D: partition. This will need to be moved to the end of the drive before Windows will allow you to make use of that extra space. Ideally that EFI partition should be at the beginning of your (D:) drive.
To shrink a volume on Windows, start by pressing Win + R to open Windows Run. Then, enter compmgmt.msc in the Run text box and press Enter to open Computer Management. In the Storage section of the left panel, select Disk Management. In the right panel, right-click the volume you want to shrink and select Shrink Volume.
Step 3. Right-click on C: system partition and choose to Extend Volume on the dropdown options. Step 4. Follow the Extend Volume Wizard instructions and select default options to merge the two partitions for Windows 10 successfully. Step 5.
First, right-click on the System C: drive and select "Resize/Move". Then, drag the system partition end into the unallocated space so to add it to the C: drive. And click "OK". And next, click "Execute Task" and "Apply" to execute the operations and extend the C drive. Step 3. In reply to Unable to create New partition for Unallocated Space. 1. In the Install Windows screen, press Shift+F10 to open a command prompt. 2. Type "diskpart" and press Enter. 3. Type

My problem is exactly the same: I upgraded from Windows 7 to 10 on a 250GB disk, cloned it to a 1TB disk and ended up with a 232GB system partition (C:), directly followed by a 450MB recovery partition, followed by close to 700GB unallocated space. I would like to extend C: to the unallocated space.

Press on Windows key + R your keyboard and type in diskmgmt.msc. This will launch Disk Management. Back up the partition to be deleted to an external drive. Right-click on the said partition beside Drive C. (This is usually Drive D) and select Delete Volume. Confirm to apply all the changes. After the Drive C is unallocated, right-click on the Hi Donia, I am Dave, I will help you with this. Windows has very limited partitioning capability, it can only extend a partition into a space that is immediately to the right of the partition, because the D drive partition is between the C drive partition and the unallocated space, Windows cannot extend that partition.. User can extend specified partition by taking free space from other partition on the same disk. I have no idea why it shows the 230gb unallocated in the dropdown, it is contrary to the wording of the message.. You could extend C to incorporate that 70.6gb unallocated space. When it is inside partition C it becomes free space.
So your D partition cannot be expanded because the free space is on the left side. I recommend that you temporarily move the files from the D partition into the C partition, 7.8G should not take too long. Then delete the D partition, merge the free partitions, and re-create the D partition. [以下不是回复内容]
\n\n unallocated space windows 10 cannot use
In Disk Management, we can select an unallocated space and then make use of the New Simple Volume feature to create new partitions. However, in some cases, this feature is greyed out as shown in the picture below, making us unable to create partition on unallocated space Windows 7/8/10.
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    • unallocated space windows 10 cannot use