On 11/5/19 8:35 PM, Hongyi Zhao via arch-general wrote: > 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 > The biggest issue is this doesn't work because the ISO file *already has* partitions/a partition table on it (which is what lets you DD directly onto a block device rather than requiring partitioning of the target device first): [bts@cylon tmp]$ sudo kpartx -l archlinux-2019.11.01-x86_64.iso Warning: Disk has a valid GPT signature but invalid PMBR. Assuming this disk is *not* a GPT disk anymore. Use gpt kernel option to override. Use GNU Parted to correct disk. loop0p1 : 0 1300480 /dev/loop0 0 loop0p2 : 0 131072 /dev/loop0 164 [bts@cylon tmp]$ sfdisk -l archlinux-2019.11.01-x86_64.iso Disk archlinux-2019.11.01-x86_64.iso: 635 MiB, 665845760 bytes, 1300480 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x65cc13ea Device Boot Start End Sectors Size Id Type archlinux-2019.11.01-x86_64.iso1 * 0 1300479 1300480 635M 0 Empty archlinux-2019.11.01-x86_64.iso2 164 131235 131072 64M ef EFI (FAT-12/16/32) [bts@cylon tmp]$ parted --script archlinux-2019.11.01-x86_64.iso -- print Model: (file) Disk /tmp/archlinux-2019.11.01-x86_64.iso: 666MB Sector size (logical/physical): 512B/512B Partition Table: msdos Disk Flags: Number Start End Size Type File system Flags 2 84.0kB 67.2MB 67.1MB primary fat16 esp -- brent saner https://square-r00t.net/ GPG info: https://square-r00t.net/gpg-info
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