To begin, the disk is divided into concentric  circles of tracks.

首先，磁盘被分成多个同心圆的磁道。

The latest hard drives can have more than 500,000 tracks on just one side.

最新的硬盘仅一面就可以有超过 500,000 个磁道。

The UNIVAC used half-inch-wide tape with 8 parallel data tracks, each able to store 128 bits of data per inch.

UNIVAC 使具有 8 个并行数据磁道的半英寸宽磁带，每个磁道每英寸能够存储 128 位数据。

Note that the read head is much smaller than the  write head, and as a result one shingled track can be reliably read at a time.

请注意， 读取比写得多，因此一次可以可靠地读取一个叠瓦磁道。

After that, we'll  dive into exactly how the drive stores data using the read and write head, and in the process, we'll  look at the tracks, sectors, and magnetic domains of the metal disk.

之后，我们将深了解驱动器如何使读写存储数据，在此过程中，我们将研究金属磁盘的磁道、扇区和磁畴。