The BIOS authenticates the disc by reading a specific high-density security ring. IP.BIN Execution:
But here, in the confines of the BIOS, none of that failure existed. The Dreamcast was immortal.
If you are diving into the world of Dreamcast emulation, or looking to modify original hardware, the is the most critical component you need to understand. What is the Sega Dreamcast BIOS?
Later Dreamcast models (VA2.1) removed MIL-CD support entirely, making them unable to play burned discs or use boot discs.
Are you aiming for or a hardware modification project?