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Unpopular Opinion
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If your CD gets one deep scratch or crack the entire thing is rendered unplayable except in lucky cases and with specialized hardware/software/knowledge, and even then it’s a crap shoot - a lot of times what is reassembled isn’t enough to translate into sounds. Strong magnet? Unplayable. 0% of the music can be recovered in a lot of these scenarios. Hung around in the attic for 30 years? Probably corrupted.
It’s more complicated than you’d think! CD’s are easier to accurately reproduce/store and carry more info, but vinyl is far more resilient. It takes a lot of work to make it so you can’t hear what’s on it anymore. Only reliable way is to shatter into a LOT of pieces or melt it down
Edit: added some clarifying language
Strong magnet?
Most CDs use aluminum or an aluminum alloy as the reflective layer. A polycarbonate layer holds the data. I suppose it's possible that a strong enough magnet could pull up the metal reflective layer off the disc if it was indeed a ferrous metal, but personally I have never experienced a magnet ruining a CD.
You’re right I’m an idiot. I’m thinking of VHS tapes