Games can be installed directly to the HDD1 or external USB drives, reducing stress on the DVD drive and often improving load times.
While both mods allow for running unsigned code (homebrew and backups), they use different methods: The Bureau XCOM Declassified [Jtag/RGH]
Use a tool like 360MPP to extract the game's ISO into a folder containing a default.xex file. Games can be installed directly to the HDD1
A hardware-based exploit that uses a "glitch chip" to trick the CPU. It is more common today as it works on most Xbox 360 models and the latest dashboard versions. Core Game Experience The Bureau XCOM Declassified [Jtag/RGH]