So as the particles on the disk that get the current in the read/write head moving put together millions of these magnetized segments and you've got a file.

通过读写头你就可以得到每个粒子的极性,如果把这些上百万粒子的信息,汇聚要一起就够成了一个文件。

哈佛公开课 - 计算机科学课程节选

The bits are still there, much like bits are still left when you erase a file on your hard disk but they're forgotten about.

二进制数还在那里，就像你在硬盘上删除一个文件,二进制还在那里,但是它们被遗忘了。

哈佛公开课 - 计算机科学课程节选