ElTorito doesn't include normal boot record on the CD-ROM. Placing MBR or similar is a hack used among other things to support the ability to "burn" image to di

ElTorito doesn't include normal boot record on the CD-ROM. Placing MBR or similar is a hack used among other things to support the ability to "burn" image to disk drive that is not CD/DVD. El-Torito specifies a bunch of different possible images, among them floppy images (used by Win9x boot CDs) and native images (used by most linux bootloaders and by later WinNT versions), and there's IIRC separate type for UEFI bootloader. There's still space left in front of the CD allowing for bootsector tricks, which is also how hybrid HFS+ disks work at all (there's space to fit necessary volume header, and Mac booting uses HFS+ "blessed file" pointer to find boot image).