efi
so I think this bootable USB support both boot modes). But later I learned that UEFI mode is better than legacy (BIOS) mode. So I first confirmed which boot mode I am in by typing msinfo32
in run dialog and it display legacy
.clear
command. 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.lsblk
to find the device name for your disk (usually /dev/sda
).gdisk /dev/sda
to open the partitioning tool. It'll automatically do the conversion in-memory.w
command to write the results out to disk and exit.bcdboot
(as documented in other threads) to convert the existing Windows installation to UEFI mode.cmd
, press Ctrl+Shift+Enter.