The following link appears to be an authoritative specfication for El
Torrito bootable CDs.
http://www.phoenix.com/PlatSS/PDFs/specs-cdrom.pdf
The bootable image may emulate a floppy disk, a hard drive, or
it may boot in a non-emulation mode. In the latter case, the boot
image may simply be executable code without any file system. The
image can be extracted from the CD, but you would need a disassembler to
interpret it. Mkisofs can create no-emulation boot images, hovever, the
-b option is restricted to floppy-emulation images.
This answers my own question about the restrictions of mkisofs.
Dave
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