System Disc 2

The System Disc 2 is a unique disc which, upon being read by the GD-ROM drive, will unlock the Dreamcast's GD-ROM media security check, allowing one to access and play games on GD-R media. It is the successor to the "System Disc" CD-ROM that was originally used for similar purposes on the Sega Saturn console.

The System Disc 2 also has hidden functionality: if the user connects a controller to port D and holds the Y button as the software loads, a menu will appear that allows the user to view the console's bootROM version string as well as an IP.BIN header viewer that can validate the header and display the flags set on the inserted disc.