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This thing is called a 5D optical data storage crystal. It's a little piece of fused quartz, etched to remarkable precision using a femtosecond ultraviolet laser.
The "5D" part of the name is just a marketing gimmick (it only has three dimensions, obviously), but it's impressive anyway. Using current technology, these little things can store 360 terabytes of data. Once written, these crystals can survive temperatures up to 1000°C, and could theoretically last for billions of years.
This reminds me of Project Silica (https://www.microsoft.com/en-us/research/project/project-silica/)
Do you think the efforts are related?
Microsoft ResearchProject SilicaProject Silica is developing the first-ever storage technology designed and built from the ground up for the cloud, using femtosecond lasers to store data.
@zzz Sounds like a very similar concept...