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A PC BIOS will not search for a boot sector on an ISO 9660 CD. The El Torito specification sets a CD to emulate a hard disk or floppy disk, the CD would contain one or more disk images - exact replicas - and emulate the INT 13 functions of such disks.
The standard is apparently named after El Torito restaurants. The designers of the format were eating at an El Torito when they came up with the format and wrote the first draft on a napkin.