Instructions
Turn the Xbox 360 off. Connect the device that contains the save file that you want to transfer to the hard drive. If it&'s not already, attach the Xbox 360 hard drive to hard drive bay on the left side of the Xbox.
Turn the Xbox 360 on. Scroll to the "My Xbox" menu. Select "System Settings." Select "Memory." All of the storage devices connected to the Xbox will be listed.
Select the storage device that has the save file you want to transfer. Select "System Items." Select the save file that you want to transfer. Select "Copy." When asked which device you want to transfer the file to, select "Hard Drive." To move save files, you must be signed in. After initiating the transfer, you will be asked to sign in to your profile if you&'re not already.