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[Admiral Wonderboat] Physical Media Forever
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If only physical digital media would actually last "forever" ... I think magnetic harddrives that aren't in constant use actually have the most longevity of common digital mediums.
Tapes beat spinning disks.
Here is a source I didn't read: https://www.howtogeek.com/858426/whats-the-best-way-to-store-data-for-decades-or-centuries/
My actual source is "used to professional care about longevity".
Let's do a laser-engraving into glass. Would be hard to beat that.
Too brittle. Fused quartz might work. Has high Mohs and doesn't degrade for billions of years.