Microsoft's new storage system
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It's called Project Silica and for now they have managed to store a movie on a piece of quartz. They don't talk about capacities or transfer speeds but about durability. They have subjected the medium to all possible excesses except for one that would test its fragility. -
I remember something similar in the mid-nineties, which was trying to replace CDs as an anti-copy distribution medium, and which added greater durability compared to existing media, but I understand that it must not have been profitable for those applications.
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The idea as cold storage is quite good, it could always be protected inside an encapsulation of a plastic material that prevents fragility.