Some softwares offer both a .iso
file and a .img
file. The .iso
is supposed to be burn to a CD/DVD, while the .img
file is to be written directly on a USB disk. But other softwares only provide a .iso
file. Then how to create a bootable USB from this .iso
file?
Please note that I'm not asking about tools to do this. I'd like to know what's the difference between the .iso
and the .img
files, and why or why not writing the .iso
file directly to a USB disk works. If directly writing an .iso
file to a USB disk doesn't work, how can we create a flashable .img
file from the .iso
file?