Pre-Repair Check Disc
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The Pre-Repair Check Disc (internally known as Check Disk for Pre-Repair Process) is a software disc used by Nintendo repair centres circa 2009 to check for the presence of unsigned content on a Wii system, and refuse to allow a repair if it is present. Upon starting up, it checks if an NR Checker is connected to GameCube controller ports 3 or 4 before continuing. If missing, the program calls a function to eject the disc. The source code for the disc's software was found in wiidump.7z, at the following path:
wiidump.7z/apps/pre_repairdisc/pre-repairdisc/RVLSDK/build/tests/checkForPreRepair