A CDI file is created by using the professional CD/DVD burning and ripping software DiscJuggler, which can copy multiple CDs at once, given the user has multiple CD recorders.
In the 90's, DiscJuggler was widely used to burn Sega Dreamcast games, and CDI disc images were available everywhere.
Related glossary terms
Related software tools
ImgBurn carries on from where DVD Decrypter left off! (Well, for the burning part anyway!)
Nero Burning ROM (Shareware)
Nero is the best and most complete DVDR / CDR / Blu-ray all-in-one software