To change a disk partition style from MBR (Master Boot Record) to GPT (GUID Partition Table), there are several methods depending on the situation and whether you want to keep data intact:
- Using the built-in Windows tool MBR2GPT:
- This tool is available in Windows 10 (version 1703 and later) and Windows 11.
- It converts the system disk from MBR to GPT without deleting data.
- Typically used offline from Windows recovery or can be run within Windows with the /allowFullOS parameter.
- Steps include validating the disk with
mbr2gpt /validateand then converting withmbr2gpt /convert. - It will create an EFI system partition (ESP) and update boot configuration for UEFI boot.
- After conversion, ensure your BIOS/firmware is set to UEFI mode to boot correctly.
- Using third-party software such as EaseUS Partition Master:
- Offers a user-friendly way to convert MBR to GPT without data loss.
- Allows conversion with a few clicks, preserving all partitions and data.
- Manual conversion via Disk Management or command line, but requires deleting all partitions:
- Backup all data because conversion deletes partition information.
- In Disk Management, delete volumes, then right-click the disk and select "Convert to GPT."
- Or use Diskpart command line:
diskpart,select disk X,clean,convert gpt.
Summary of the recommended approach is to use MBR2GPT for system disks without data loss or third-party partition management software for easy conversion. Manual methods require data backup and partition deletion before converting. If the disk contains an OS installation, remember to switch the firmware to UEFI to boot properly after conversion. Would instructions be needed for a specific method or operating system?
