Curupted files (MM)

You need an empty save file and one with a saved game. Choose 'copy' on the select file screen.Choose to copy the saved game to the empty file.
Before you choose 'yes' to start copying pull up the left side of the cartridge, then choose 'yes'.Once the file is copied it shows all the data for the new file, this will be very corrupted, often the name of the file is 0000000, or it will say you have all 24 masks (regardless of how many the original save file has), the number of hearts can screw up too.Unfortunately if the new file's name is different to that of the original the new file will be removed.If you then perform the 48 Ocarinas trick on the slot where the copied file was you may be able to play the corrupted game, often nothing in game will be different though.