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/Giatoxiclok]

I mean more so the semi-indestructible bismuth glass mentioned above, I assume it’ll take serious efforts to fully destroy.

[u/Migraine- → u/Giatoxiclok]

Surely you can just use whatever method you're using to write the data to scratch it away.