By Ailsa / Last Updated August 29, 2019

The Scenario

I got a brand new Dell computer with a HDD and Windows 10 pre-installed. Since the SSD drive has a better performance than HDD, so I swap the HDD for a SSD before booting the Dell computer. Then I try to do a factory reset with the Windows 10 disc, it informed me that unable to reset your pc a required drive partition is missing. I have no idea what I’m facing for, any help would be appreciated.

I bought a Dell 7353 laptop with Windows 10 preinstalled, but I want to run something other than Windows 10, so I removed the existing factory partitions using the DiskPart clean command. Then I found the OS I want to installed has no drivers to assist the 7353 hardware. Then I download the Dell Recovery Image and enable to boot from it, but it can’t be installed due to the “unable to reset your computer, a required drive partition is missing” error.

The Causes

Why the “a required drive partition is missing” message occurs to your Windows 10 computer, the corrupt MBR or BCD file should take responsible for this problem.

Apart from the above situations, you may have encountered this condition. When you start your Windows 10 computer, and received a “Your PC needs to be repaired” error message. The first thing you would do is try to refresh your PC, if you do so, you’ll probably receive a “The drive where Windows is installed is locked” message. If you try to reset your PC, you may get an error message saying “Unable to reset your PC. A required drive partition is missing”.

The culprit causing these problems is a damaged MBR or BCD file usually.

Two Solutions for A Required Drive Partition Is Missing in Windows 10

Thus, how to fix this problem? As a matter of fact, you have two ways to solve: Command Prompt and AOMEI Partition Assistant.

Solution 1: Fix with Command Prompt

To fix Windows 10 a required drive partition is missing error, you have to correct the MBR or BCD file. The first thing you need is a Windows 10 installation DVD or USB flash drive.

Step 1: Insert the Windows 10 installation DVD or USB flash drive into your computer.

Step 2: Boot into Windows 10 system recovery options, select “Troubleshoot”> “Advanced options”>“Command Prompt”.

Step 3: Then use command prompt to fix a required drive partition is missing in Windows 10 issue. Then enter the following command in turn.





Rebuild BCD

Then reboot your computer to see if the issue is fixed. The command prompt should solve your problem.

Solution 2: Rebuild MBR with AOMEI Partition Assistant

Another reliable way to fix this problem is taking advantage of AOMEI Partition Assistant to Rebuild Master Boot Record (MBR). AOMEI Partition Assistant is a powerful disk partitioning software, which makes you rebuild MBR easily, as well as compatible with Windows Vista, XP, 7, 8, 8.1,10.

Step 1: Download, install and launch AOMEI Partition Assistant. On the main interface, right click the system hard disk, then select “Rebuild MBR” at the drop down menu. Or select the system hard drive, and then choose “Rebuild MBR” at the left panel.

Rebuild System Disk MBR

Step 2: Set the type of MBR for your Windows 10, then press “OK” to go on.

Choose MBR Type

Step 3: Overview the result of rebuilding MBR at the “Pending Operations”, then press “Apply” to take effect.


Tips: Please rest assured, the process of rebuilding MBR doesn’t cause data loss.

Wait for a moment, you’ll find the problem a required drive partition is missing in Windows 10 has been repaired. In addition, AOMEI Partition Assistant also allows you to make bootable media to troubleshoot the Windows 10 cannot boot problems and fix unbootable issues caused by MBR code.