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Directly booting an ISO file - Multi-Boot USB Stick

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Method Of Date Produced [ bash ]	TZ='Europe/Malta' date +"%Y-%m-%d %H:%M:%S"
Created Date	2026-03-22 00:23:27
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Created By	--Gabriel-mlt (talk) 23:28, 21 March 2026 (UTC)

Master GRUB Multiboot USB Setup

This guide explains how to install a master GRUB bootloader onto a USB stick to boot multiple ISOs from dedicated partitions.

1. Prepare the Environment

First, install the necessary tools and identify your USB drive: <source lang="bash"> sudo apt update && sudo apt install grub-pc-bin grub-efi-amd64-bin mtools lsblk # Identify your USB (e.g., /dev/sdb) </source>

2. Partitioning the USB

Use gdisk or fdisk to create the following structure:

Partition 1: EFI System Partition (500MB, FAT32) - Target: /dev/sdb1
Partition 2: ISO/Data Storage (Remaining space, ext4 or NTFS) - Target: /dev/sdb2

3. Mount and Install GRUB

Mount the EFI partition and install the bootloader for both UEFI and BIOS compatibility. <source lang="bash"> sudo mount /dev/sdb1 /mnt sudo grub-install --target=x86_64-efi --efi-directory=/mnt --boot-directory=/mnt/boot --removable /dev/sdb </source>

4. Configure the Multiboot Menu

Create the configuration file at /mnt/boot/grub/grub.cfg: <source lang="text"> set timeout=10 set default=0

Example: Booting an ISO from the second partition

menuentry "Ubuntu 24.04 LTS Live" {

   set isofile="/iso/ubuntu-24.04.iso"
   loopback loop (hd0,gpt2)$isofile
   linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=$isofile quiet splash
   initrd (loop)/casper/initrd

}

Example: Booting Windows PE/Lite via Memdisk

menuentry "Windows Lite (RAM Mode)" {

   linux16 /boot/memdisk iso raw
   initrd16 /iso/windows_lite.iso

} </source>

5. Finalize

Ensure you copy the memdisk binary to /mnt/boot/ and place your ISOs in the /iso folder on the second partition. <source lang="bash"> sudo cp /usr/lib/syslinux/memdisk /mnt/boot/ sudo umount /mnt </source>

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