All the sectors on a disk platter that can be read without moving the head constitute a track.

磁盘盘片在无需移动磁头的前提下即可读取的所有扇区组成一个磁道。

youdao

Marine fishes with a flattened elongated body and a sucking disk on the head for attaching to large fish or moving objects.

身体扁平细长的海生鱼，头部有吸盘，可吸附于大鱼或移动的物体上。

youdao

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