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KNOPPIX is a bootable Live Linux system on CD, DVD, or USB, providing automatic hardware detection and a full desktop environment without installation. It can be used for productive work, education, or as a rescue system.
Dr Kalam OS is a premium, portable, localized live workstation that runs from a USB pendrive.
A technical blog post explaining how to create persistent live USB images for Debian, Fedora, and Ubuntu by injecting ext4 partitions and using OverlayFS, noting the lack of standardization between distributions. It covers kernel parameters, partition labels, and a hacky byte-swap trick to modify ISO boot parameters without rebuilding the image.