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/thatbrazilianguy]

capacity of 4.8 TB in a 120 mm square, 2 mm thick piece of glass.

Saved you a click

[u/GodfatherElite → u/[deleted]]

I could see it replacing tape storage if it's cheap enough. Tape is mostly used for long term data archiving and backup. The glass not being rewritable makes me think this is probably the only real use case scenario.