To convert GPT disk to MBR or convert MBR disk to GPT during Windows 10 installation, you need to create a Windows PE bootable media on another computer, and then start up your computer from the bootable media to make the conversion.
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So when I was using the guide above in the title, I came across this error while i was creating the usb. - And error occurred updating the MBR: 1" Help is appreciated.
Displays a list of disks and information about them, such as their size, the amount of available free space, whether the disk is a Basic or Dynamic disk, and whether the disk uses the Master Boot Record (MBR) or GUID Partition Table (GPT) partition style.
However, some operating systems such as Windows XP 32-bit, Windows 2003 32-bit, Windows 2000, Windows NT4 don't support GPT disk.
In these operating systems, GPT disk will be shown as GPT protective, and you are not allowed to access data in the disk unless you convert GPT to MBR. So among the large number of Windows 10 users, they need to convert MBR to GPT disk or convert GPT to MBR disk depending on their own requirements. Input "clean" and press "Enter" to delete all partitions or volumes on the selected disk. Input "convert mbr" and press "Enter" to complete the conversion from GPT to MBR format.
Note: To guarantee PC bootable after the system/boot disk has been converted from MBR to GPT, you will need to enter into UEFI firmware settings, and switch from Legacy BIOS to UEFI mode.
You may need to check your PC's or motherboard's manual for its specific instructions on how to change this setting.If you only need to convert Data disk between MBR and GPT styles, please download FREE partition manager - AOMEI Partition Assistant Standard.