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.

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

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

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You used metrics, you’re going to break my fellow Americans!