Hi, I try to use a specific partition of usb to install archlinux, the following is the step: Suppose the /dev/sdc is my usb: $ sudo ddrescue -f archlinux-2019.11.01-x86_64.iso /dev/sdc2 Then I reboot my computer with the grub standalone bootloader and from within the command line of grub, I do the following: Suppose the (hd2,2) is the partition which corresponding to the /dev/sdc2, then I run the following commands: grub> set root=hd2,2 grub> chainloader /EFI/boot/bootx64.efi grub> boot But, the above step failed to boot, with the error similar to this in my ming: Failed to find the loader.efi OTOH, if I dd'ed the arch iso onto the whole usb disk like the following: $ sudo ddrescue -f archlinux-2019.11.01-x86_64.iso /dev/sdc Then, it will be successfully booted into the installation menu of archlinux. So I want to know whether is is possible for me to use a specific partition of usb instead of the whole usb disk for installation archlinux? Regards -- Hongsheng Zhao <hongyi.zhao@gmail.com> Institute of Semiconductors, Chinese Academy of Sciences GnuPG DSA: 0xD108493