Question - Multi disc in one disc

[nico7550]

Hi, I'm Nico, I'm hope it's not a repost but I cannot found anything (maybe due to my search words...) so please if it's a repost don't blame me just ignore me. Thanks

I found a D2 2 discs in one disc release. Do you know how it's done and if it can be done to others multi disc games ? (I have a terraonion ODE and I don't really like how it handle the changing procedure.

Thanks