I just realized that while Sam might understand that explanation, few others on Debian-User would. So here's why when you ask about bootable CDs I start talking about floppies. The El Torrito bootable CD format makes your CD masquerade as a floppy during booting. Thus, you start by constructing a bootable floppy and testing it. Once you do that, you pass the floppy image to mkisofs. It stores the floppy image and an index file on the CD. You then set your BIOS to boot from CD. BIOS provides a driver that looks like a floppy, but actually accesses the floppy disk image on the CD, using the index file to map CD blocks to floppy blocks.
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