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The GameCube's disc format, known internally as NROM, uses a custom filesystem and a basic XOR encryption scheme tied to the disc's [[wikipedia:Burst_cutting_area|BCA]] to prevent unauthorized reading and copying. However, the discs are otherwise physically identical to [[wikipedia:MiniDVD|miniDVD]] discs, which in turn are reduced-size standard DVDs; therefore, if the GameCube's disc drive is hacked using an external device to disable the security mechanism, it can read standard miniDVD and DVD discs. Some PC DVD drives can also read GameCube discs, although software such as [https://wiki.gbatemp.net/wiki/RawDump RawDump] is necessary to access their contents. Early in development, the GameCube used full-size discs equivalent to DVDs.

The GameCube's disc format, known internally as NROM, uses a custom filesystem and a basic XOR encryption scheme tied to the disc's [[wikipedia:Burst_cutting_area|BCA]] to prevent unauthorized reading and copying. However, the discs are otherwise physically identical to [[wikipedia:MiniDVD|miniDVD]] discs, which in turn are reduced-size standard DVDs; therefore, if the GameCube's disc drive is hacked using an external device to disable the security mechanism, it can read standard miniDVD and DVD discs. Some PC DVD drives can also read GameCube discs, although software such as [https://wiki.gbatemp.net/wiki/RawDump RawDump] is necessary to access their contents. Early in development, the GameCube used full-size discs equivalent to DVDs.

The GameCube's capacity for preinstalled software is limited to a ROM chip attached to the [http://hitmen.c02.at/files/yagcd/yagcd/chap10.html EXI] interface, which the CPU boots from by default. This ROM chip contains a boot program which will initialize the system, play the boot animation and start the inserted disc or display the console menu. A XOR encryption scheme is also used on the ROM data.

The GameCube's capacity for preinstalled software is limited to a ROM chip attached to the [http://hitmen.c02.at/files/yagcd/yagcd/chap10.html EXI] interface, which the CPU boots from by default. This ROM chip contains a boot program which will initialize the system, play the boot animation and start the inserted disc or display the console menu. A XOR encryption scheme is also used on the ROM data, this is done by a diskId(8 bytes) and a random number for each data sector.

The GameCube has no proper operating system; the boot program does not keep executing after it launches a game or expose any "BIOS" functions, and all code which runs once a game has been started is loaded from the game disc. The Dolphin SDK includes an "OS" library with some basic functions for system features such as thread/memory management.

The GameCube has no proper operating system; the boot program does not keep executing after it launches a game or expose any "BIOS" functions, and all code which runs once a game has been started is loaded from the game disc. The Dolphin SDK includes an "OS" library with some basic functions for system features such as thread/memory management.