HoloMem: Long-term storage system uses lasers to burn tiny holograms into light-sensitive polymer

https://au.news.yahoo.com/why-data-being-stored-glass-230338564.html

"holograms store data in multiple layers, multiplexing layers multiple sets of information in 1 space... can handle -14 to 160°C temperature... polymer  good for >50 years... data can't be tampered with once written... low cost, widely available components including laser... Microsoft is competitor: Project Silica uses powerful lasers creating tiny structural changes in glass, called voxels... 2mm thick size of DVD stores >7 terabytes,  immune to temperature, humidity, particulates, electromagnetic fields, 100 to 1K years life"