How strong of a magnet do you need to erase the data on an old-fashioned tape backup system (as in, one of those things that spins around with reels and tapes)?

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How strong of a magnet do you need to erase the data on an old

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Vinyl Styl Audio Cassette Head Cleaner & Demagnetizer

How strong of a magnet do you need to erase the data on an old

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I accidentally put cassette very close to large magnet, what do I

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