CSM in EFI is the official abbreviation for “Compatibility Support Module,” but it means “boot normally” (with the traditional boot record and bootloader from disk). If in doubt, choose the “CSM” boot option in your computer’s BIOS. If the EFI firmware is set to “Secure Boot,” booting from anything but the “allowed” operating system is impossible. Some computers still can’t boot from flash drives, though, either because they are too old (i.e., the BIOS does not have an option for booting from USB) or because they have boot firmware like EFI that does not allow booting from external hard disks.Īn efi directory on the first partition of the Knoppix-installed drive contains all the files needed to boot on an EFI-aware computer. Booting from flash is quick and easy because all changes and stored files are written to the data partition automatically.
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