To resolve this behavior, delete the first partition, delete the existing EFI system partition, and then restart Setup. Setup will then automatically create the EFI system partition as the
first partition on the drive.
Warning When you delete a partition, all data on the partition is permanently deleted. After you delete a partition, your computer may not start. Do not delete a partition unless you are familiar with this process.
You can use Recovery Console, the Windows Preinstallation Environment (Windows PE), or a third-party low-level format tool to delete the existing first partition on the drive. For example, you can use the Windows Recovery Console and the Diskpart utility to remove the first partition and the existing EFI partition, and then you can run Setup to re-create the EFI system partition as the
first partition on the drive. To do this, follow these steps:
1. | Start your computer by using the startup disk, and then press R to start Recovery Console. |
2. | At the command prompt, type diskpart to start the Diskpart utility.
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3. | Click to select the first partition on the drive, and then press D. |
4. | Click to select the partition that contains the [Reserved] text, and then press D. |
5. | When you are prompted to confirm deletion of the Microsoft Reserved partition, press ENTER, and then press L. |
6. | Press ESC to exit the Diskpart utility.
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7. | Restart your computer, and then restart Setup. |
Setup automatically creates the EFI system partition when there is space at the start of the drive and when no other EFI system partitions already exist.