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I had a friend with a Dreamcast he had to mod it to play CDRs as the Dreamcast had a different CD format to hold more info. They had to reduce the CD to fit in

I had a friend with a Dreamcast he had to mod it to play CDRs as the Dreamcast had a different CD format to hold more info. They had to reduce the CD to fit in a 700M CDR. Most games didn't use the full CD. Google mod chips some time they had them for the Playstation and XBox to use CDRs.

ac2u 8y ago
You didn't have to physically mod the Dreamcast console. An exploit was found due to the console support for CD's with multimedia support, called MIL CDs. Initially a bootdisc was needed which you swapped with a CD-R, later all dumps of games were done in such a way that the exploit was bundled. You are correct though in that some games used the full 1GB+ capacity of the GD-ROM format and assets had to be removed/compressed in some cases.