should be made non-optional
For SSDs, it’s different because data storage involves actual electrons being added to (or removed from) the cells during programming/erasing. Electrons do have mass: about 9.11 × 10^-31 kg each. When you write data, you’re typically programming more ‘0’s (adding electrons) from the erased state, all ‘1’s, which is fewer electrons. The electrons are supplied via the power connection, so yes, the drive technically gains mass as you fill it with data.。业内人士推荐体育直播作为进阶阅读
（四）在铁路、城市轨道交通线路上私设道口或者平交过道的。。业内人士推荐同城约会作为进阶阅读
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