It is possible that 500 Mo be insufficient for some distros. drive file=/tmp/disk,format=raw,index=1,media=disk \ drive file=/dev/sdc,format=raw,index=0,media=disk \ drive if=pflash,format=raw,file=/tmp/OVMF.fd \ Assuming the device is plugged as /dev/sdc and we have a raw disk image /tmp/disk we want to use, it can look like that:
Install grub on usb iso#
ISO images can then be copied to the key and stances added to boot/grub/grub.cfg like explained in this article.Įxtra: to test the disk without rebooting a machine, we can use qemu, with the packages qemu-system-x86, qemu-system-gui and ovmf for the UEFI firmware. Let us put something in the device and unmount it.
Install grub on usb how to#
I had an opportunity to learn how to boot from USB using GRUB. Moreover, ever since I installed GRUB, the shortcut to summon booting device selection stopped working. If background_image /boot/grub/grub-16x9.png then I prepared a USB stick with the new system, but I couldn’t boot from it BIOS was restoring the booting order on every reboot. Sfdisk -no-reread /dev/sdc /media/boot/boot/grub/grub.cfg <
Install grub on usb install#
We need a GPT scheme with a big data partition, a small EFI system partition (~100 megaoctets usually recommended, less than on required for GRUB) and a tiny BIOS boot partition (necessary to install MBR GRUB). 4) Create a new directory to hold grub on the target drive: mkdir /mnt/sdc1/boot/grub. In my case, sdb1 was my active Porteus USB drive (which was already mounted), and sdc1 was the target drive. Just wipe the areas outside the main partitions.ĭd bs=512 if=/dev/zero seek=0 count=2048 of=/dev/sdcĭd bs=512 if=/dev/zero seek=15767552 count=2048 of=/dev/sdcĬreate the partitions. Replace sdc1 with whatever partition you are installing to. Device path:įirst, let us wipe the device, so that traces of previous partitions and attemps do not interfer.
Note that sfdisk is probably not in the default path. We assume we have read and write permissions on the device and use pmount to mount partitions, but otherwise we do not need root privileges. The size can be obtained from /proc/partitions (un units of 1024, so need to multiply by 2) or using /sbin/blockdev -getsz. This is written as a script, to have it compute the partitions positions and sizes automatically based on the size of the USB stick. It is a complement to this article about using GRUB to boot a live image written as a file rather than an image.Īfter this, the device has a little wasted space and a directory named boot, but is otherwise completely usable for other tasks. The purpose of this article is to explain how to install GRUB on an USB stick, or any other kind of USB mass-storage device, to make it bootable in either legacy BIOS or UEFI mode and allow to load live images installed in a directory. Installing GRUB on an hybrid BIOS/UEFI stick
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