The goal is to create – a container that holds the raw disc data but also stores a JSON manifest of the game's "hash tree" for instant verification.
Furthermore, the architecture of the Xbox was notoriously difficult to emulate. While the PS1 and N64 were cracked early on, the Xbox’s x86 architecture and specific NVIDIA drivers made accurate emulation a nightmare. For a long time, the best way to play an Xbox game was to simply own the hardware. Because the hardware was durable and the discs were cheap, the "need" for XISOs remained low. Xbox Xiso Roms
: XISOs are a "clean" way to store backups of a physical collection in a single file per game. Modern Enhancements The goal is to create – a container