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Yeah "stone" 100GB M-DISC bluray discs are ~$10/ea. 100GB for 100yrs* ($0.10/GB). https://amzn.to/3KpYAfl

*maybe

Those are nice, but we need 10TB now.

They used to make BD-Rs using this technology, but switched to a cheaper (supposedly not as long lasting) method without any change in branding. It was a minor scandal among datahoarders

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