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The initial booting process involving the boot record is easy. BIOS will read that. But then the boot record must know how to read 'sectors', know where to look for the directory, and understand that directory format. You need a bootstrap program that understands the CDFS data structure. If the bios has such a routine, then no problem. But BIOS typically only understand enough to read first few sectors on a hard disk. Your bootstrap loading program must be larger to include a driver to do what is normally done by BIOS (motherboard Eprom) software.
I don't know what that USB boot program reads and I don't know where one finds tech material to explain how it works. I simply reverse engineered and single stepped through MBR, BIOS and other software to learn how a computer boots from FAT and NTFS drives. And I did so by using DOS because Windows NT makes that information 'secure'.
A great idea. It would be so easy if using a hardware emulator. And I am sure you don't want to buy or rent one of those.
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