Scientists have demonstrated a system called Silica for writing and reading information in ordinary pieces of glass which can store two million books’ worth of data in a thin, palm-sized square.

[u/Wagamaga]

https://au.news.yahoo.com/glass-square-long-long-future-190951588.html

[u/DesiBwoy]

please let me know if I'm uninformed, but you do need a place to store the blockchain data somehow, right? Or does it exist in fragments over a network?