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想像一下，把硬盘上的所有数据都放到一张磁盘上并带着它上路的感觉：永远不会看到“磁盘空间不够”的提示信息的感觉
Imagine putting all the data on your hard drive on a single floppy disk and taking it on the road: you will never see the message “Insufficient disk space”