![]() ![]() ![]() If in UEFI mode on installed system, boot into the Target drive and run the above.Īnother method to make a bootable USB is to boot ISO files directlyīIOS/UEFI Template Image for Booting ISO Files Sudo grub-install -boot-directory=/mnt/boot /dev/sdx Install grub, if in BIOS mode or booted from USB drive run: sudo mount /dev/sdx2 /mnt Tl dr When you recreate the ISO from the extracted files, you are not (correctly) transferring either the BIOS bootblock, nor the EFI System Partition, or ESP, to the newly created USB drive. Therefore, the system will not be able to boot from this disk. The system firmware does not to know how to boot the operating system on the drive, and instead passes on that responsibility to a small program called the bootloader. ![]() It is stored on the disk in a specified location where the firmware can find it easily. The location where the bootloader is stored is dependent on the method used by the firmware to boot the disk. There are two different boot methods in use today on x86-64 platforms, the modern EFI and legacy BIOS boot. ![]()
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