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.
2014年，罗伯·莱纳与妻子偕三名子女杰克、罗米、尼克（右三至右一）出席活动。
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本报北京3月3日电 （记者杨昊）《习近平走进百姓家》（第二辑）出版座谈会近日在京召开。国务委员、全国妇联主席谌贻琴出席并讲话。