Ventoy
Ventoy is a tool to create bootable USB drive for ISO files. You don't need to format the disk, just copy the image files to the USB drive and boot them directly.
You can copy many files at a time and Ventoy will give you a boot menu to select them (screenshot). Both Legacy BIOS and UEFI are supported in the same way. 470+ ISO/WIM/IMG/EFI files are tested.
Ultimate Boot CD 5.3.9 assembles over 100 PC hardware diagnosis tools into one bootable CD to analyze and repair hard drives and to fix boot problems (CD iso).
Hiren’s BootCD PE contains many tools you can use for analyzing, recovering and fixing your computer, even if the primary operating system can not be booted (CD iso).
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