HDDs, or more amusingly called, “spinning rust”, store data by flipping the magnetic polarity of tiny domains on the platter to north/south poles which represent 0/1. This rearranges existing atoms without adding or removing mass, it is just a change in orientation. There’s a minuscule energy difference that equates to a mass change via E=mc², but it’s on the order of 10^-18 grams for a full drive, utterly negligible.
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Anthropic’s team got in touch with Firefox engineers after using Claude to identify security bugs in our JavaScript engine. Critically, their bug reports included minimal test cases that allowed our security team to quickly verify and reproduce each issue.