Microsoft's Project HSD is all about holographic storage for the cloud
As the video above explains, holographic storage works by writing and reading data from an optical crystal. Since it’s a three-dimensional storage medium, it allows you to store a large variety of data sets within one crystal. Afterwards, it can be wiped clean with UV light and reused. Technically, this is a better solution than flash storage, which has limited read and write capabilities, and hard drives which are prone to mechanical failure.
Devindra Hardawar, @devindra September 23, 2020