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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‘Stopgap measure’ designed to keep oil flowing into global market as Middle East crisis disrupts crude shipments
另外还有每日回顾功能，会按策略选取历史笔记通过企业微信定时推送，帮我重新审视过去的想法。
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