Not solid state media, though; now we know why the world is shifting to SSDs! It's all an ~~AI~~ Antichrist plot!
Though, I guess if OP's magnet is comically large enough, it could just physically damage the circuitry, and it won't matter. You're the savior we need, OP!
It's all about that plausible deniability.
"What did you think it meant? Oh my god, you pervert!"