Huh, TIL. And a link from there to explain why: https://books.google.com/books?id=BjoEAAAAMBAJ&dq=hard+disk+glass&pg=PT7 https://books.google.com/books?id=BjoE

Huh, TIL. And a link from there to explain why: https://books.google.com/books?id=BjoEAAAAMBAJ&dq=hard+disk+glass&pg=PT7 https://books.google.com/books?id=BjoEAAAAMBAJ&dq=hard+disk+...