It's not a commercial release or an official update — it's a warez scene dump intended for hacked consoles.
However, our focus lies on the XBLA, Arcade, and JTAG/RGH versions of the game. For XBLA, Sonic CD was a significant release, as it marked one of the first major Sonic titles to hit the platform. The game was made available for purchase on December 7, 2010, and quickly gained popularity among Xbox 360 owners. Sonic CD -XBLA--Arcade--Jtag RGH-
To run this Arcade title on your modded console, follow these steps to place it in the correct directory: It's not a commercial release or an official