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August 6th, 2020, 4:21
I tried looking up some documentation but they are so limited.
It's a really long story why i need this so if anybody knows please help me. Don't ask me why otherwise please.
So this iso boots both UEFI and legacy but i want to destroy its ability to boot BIOS. I burn the iso to HDD btw.
I just need to know how UEFI is different than BIOS in terms of MBR structure.
August 6th, 2020, 17:41
UEFI doesn't use the MBR code for booting. Instead it searches for a boot partition. Therefore you should be able to write zeros to the MBR without affecting a normal UEFI bootup. I don't know how GRUB fits in, though.
Someone please correct me if I'm wrong.
August 16th, 2020, 6:41
Late thanks, filling with zeroes does work.
dd if=/dev/zero of=/dev/sdX bs=446 count=1
dd if=/dev/zero of=/dev/sda bs=446 count=1
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