The most common third-party tool for in-place conversion is gdisk (aka gptfdisk), which costs $0.00. If the disk has data that you want to keep, then your only choices are to upgrade to a Windows version that has mbr2gpt, or use third-party software.Īlso all of the third party softwares are paid Would that cause any problems when installing windows in UEFI mode ?ĭiskpart only allows "converting" empty disks, so you'll need to delete all partitions using the clear command. If I disable the legacy support I am still not able to select secure boot its still grayed. So how would I reinstall windows in UEFI mode ? Any help would highly appreciated. X:\Sources> select disk 0 (as my hdd was disk 0)īut it says error disk is not convertible. So I tried doing it with diskpart utility by booting from bootable USB and opened up cmd in the repair windows and typed these commands: X:\Sources> diskpart I know I would need to convert to GPT partition style before I install windows 10 in UEFI mode.īut I don't want to use third party softwares and I also don't want to update to windows creator update probably because windows update takes lot of time and data also all of the third party softwares are paid. I also checked my hard disk partition style, its MBR. So I first confirmed which boot mode I am in by typing msinfo32 in run dialog and it display legacy. But later I learned that UEFI mode is better than legacy (BIOS) mode. Yesterday I installed windows 10 from a bootable USB (which contains a folder named efi so I think this bootable USB support both boot modes).
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