Now, if the current is sent one way through the read/write head the area is polarized in one direction.

如果当前通过读写头来发送指向一个方向的信息,这个区域的磁极指向某个方向。

哈佛公开课 - 计算机科学课程节选

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