By AOMEI / Last Updated March 11, 2019


“Hi, sorry if this is a duplicate thread. I looked around but couldn’t find a thread with the same problem or a solution. Anyways, my computer is running Windows 10. I intend to delete a partition, but I find the Delete Volume is greyed out. So I don’t know what to do. Please help! Thanks in advance!”

Why cannot delete partition Windows 10?

If you are unable to delete partition in Windows 10/8/7, and the “Delete Volume” option is greyed out in Windows Disk Management. Then probably the partition is a system partition or the partition is write protected.

If the partition you want to delete is a system partition, you are unable to the partition holding the OS within Windows when the OS is running. The System Protected Partitions on the main (OS) disk, should not be erased because your system will not be able to boot.

If the partition you want to delete is write protected, you should remove write protection at first. Otherwise, you cannot delete it by Disk Management too.

How to delete partition in Windows 10/8/7?

Is there any easy way to delete a partition? The answer is obviously "yes". Using a third party tool to delete system partition or write protected partition can be very easily and effectively. Here AOMEI Partition Assistant is highly recommended. It’s a powerful third party partition assistant, and provides users many useful functions like Make Bootable Media, Format Partition, Delete Partition and so on.

Download AOMEI Partition Assistant in advance, and follow the steps below depending on your partition.

Delete System Partition

Step 1. Insert your USB drive to the computer and run AOMEI Partition Assistant. Click “Make Bootable Media” and do as the following prompts to create bootable USB. Then, reboot the computer from the created bootable USB drive.

Boot From USB Device

Step 2. After that, you will be in the main interface of AOMEI Partition Assistant. Right click the system partition and select “Delete Partition”.

Delete System Partition

Step3. In the pop-up window, choose “Delete Partition Quickly”. Then, click “OK”.

Delete Partition Quickly

Step 4.Then, go back to the main interface, click “Apply” > “Proceed” to commit this operation.

Apply Proceed

Delete Write Protected Partition

If you find the partition you want to delete is a secondary disk, and shows “Current Read only state yes”, you should remove write protection from it at first. Then, delete it with the help of AOMEI Partition Assistant or use Windows built-in Diskpart to delete it. The specific steps for deleting partition on a secondary disk via AOMEI Partition Assistant are consistent with the delete partition step mentioned above.

The specific steps of delete partitions on a secondary disk via Diskpart are as follows:

1. Press “Windows” + “R” to open the Run box, then type “diskpart” in the Run dialog and press “Enter”.

2. After that, type the following command and hit “Enter” after each command.

list disk

select disk n (here “n” is the disk number of the partition you want to delete.)

list partition

select partition m (here “m” is the partition number, and you need to select the partition you want to delete.)

delete partition

3. When done, type “exit” to close the diskpart utility.


That’s all folks, and you know how to delete partition effectively now. AOMEI Partition Assistant is such a magical partition. If you find C drive full in Windows 10/8/7, you can upgrade to AOMEI Partition Assistant Professional to solve this problem and enjoy more advanced features.