With sequential access, the disk head can move directly to the next available track on the disk.
使用顺序访问，磁盘头可以直接移动到磁盘的下一个可用磁道。
As mentioned above, random access requires the disk head to move randomly over the disk to find the proper data points.
正如上文提到的，随机访问要求磁盘头能随机移动到磁盘上，查找对应的数据点。
Then, the server's disk head had to move randomly over all areas of the disk to get to the proper track and sector for the data that was changed or updated.
然后，服务器的磁盘头随机移动到磁盘的各个区域查找更改或更新过数据的磁道或扇区。
The magneto-optic head flies much farther from the disk surface than a magnetic disk head, and the magnetic material is covered with a protective layer of plastic or glass;
光电磁头距离盘面的距离比磁头远，并且磁介质上覆盖有塑料或玻璃的保护层；
The magneto-optic head flies much farther from the disk surface than a magnetic disk head, and the magnetic material is covered with a protective layer of plastic or glass;
光电磁头距离盘面的距离比磁头远，并且磁介质上覆盖有塑料或玻璃的保护层；
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