11/6/2023 0 Comments Active boot disk for windows 10![]() If you don’t have Windows installation media, you can use AOMEI Partition Assistant Professional to create a bootable USB drive and enter WinPE environment (refer to the first method), and then directly rebuild damaged MBR via this software. In the Windows Setup window, press Shift+F10 to open Command Prompt, and then execute the following commands: For this task, you need to boot your computer from the Windows installation media. To fix damaged boot manager, you need to run some commands in Command Prompt. When all are done, you can reboot your computer to check if "The selected disk is not a fixed MBR disk" is resolved. And change its value to "Legacy".įinally, navigate to the Exit section and choose "Exit Saving Changes". Now, navigate to "Boot" tab and select "Boot mode" option. In the “Secure Boot Configuration” menu, choose "Secure Boot" and modify the setting to "Disable". Use the arrow key to access "Security" menu, select "Secure Boot Configuration" and press "Enter". Turn on your computer and enter BIOS settings by pressing a specific key (F1, F2, Del, etc) when the system is about to start. Click "Apply" to commit the operation.īecause GPT is closely related to UEFI boot mode, you can try to disable it and switch it to BIOS legacy. Right-click the system disk and select "Convert to MBR Disk". When you log in, you will enter the main interface of AOMEI Partition Assistant Professional. Plug the created bootable USB drive into the computer with boot failure, and boot comptuter it from the bootable media. Click “Tools” in the top toolbar, and choose “ Make Bootable Media” and follow the wizard to finish creating a bootable USB stick. Insert an empty USB drive into a working Windows computer, install and run AOMEI Partition Assistant Professional on that computer. Moreover, it can help you create a bootable media and then convert the system disk to MBR in WinPE mode when your computer cannot boot into Windows successfully. It can change the boot disk between MBR and GPT without deleting partitions existing on the disk, so data loss can be avoided. To make it easier and safer, you can turn to AOMEI Partition Assistant Professional. Namely, you will lose system partition and need to reinstall Windows after the conversion. But you must delete all existing partitions on the GPT disk, otherwise the conversion will fail. Usually, you can run the diskpart tool to convert GPT disk to MBR. Since a GPT disk is related to UEFI boot mode, and this boot method cannot recognize such a concept as an active partition, so converting it to MBR might solve this issue. Convert GPT disk to MBR without data loss How to fix "The selected disk is not a fixed MBR disk" issue?Īccording to the above possible causes for the "active command can only be used on fixed MBR disks" issue, you can try to convert GPT disk to MBR, change UEFI to BIOS, or repair the damaged boot manager to check whether the problem can be fixed or not. ![]() Besides, if there is something wrong with the boot manager or you set the boot mode to UEFI, this error will appear, too. In other words, this “active” command only works for a BIOS/MBR-based system, not for UEFI/GPT-based system. If the partition you wish to mark as active is located on a GPT (GUID partition table) disk, or we can say the disk partition is on a UEFI System partition, the error will occur. The active command can only be used on fixed MBR disks." Any advice? Thanks! What causes this problem? I read some guides and learn I need to make primary partition as active in Diskpart, but when I did that, I got the following error message: "The selected disk is not a fixed MBR disk. So I boot it from a created bootable USB and from there I tried to repair the start. After a Windows 8.1 update, my computer booted into a black screen. ![]()
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