The audio reading electrical with the styles in the grooves, where the video is reading with the vibrations of the stylus in the grooves.
So i ask myself, can you remove the sound from a CED disc with a magnet? as audio cassette tapes and floppy drives?
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Nope,its not a magnetic surface like tapes are.I think,therefore i am a hamster.
CED use variable capacitance to store signal (variable capacitance between disc and stylus)- you can damage it in mechanical way but as johns0 already wrote this type of recording can't be damaged by magnetic field.