Just as it is sometimes useful to speed up to move quickly through writing with a low information density, you often need to slow down to catch the important or confusing bits.

有时候你需要快速浏览过一些信息密度很低的内容，但对于一些重要或感到困惑的内容则应该慢慢读。

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Therefore, further increase of magnetic recording density is largely confined by the writing ability of the magnetic head.

因此，记录密度的继续提高，很大程度上受限于磁头的写入能力。

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Along with the increase of the track density of hard disk, the accuracy of servo track writing and the difficulty of servo track writing are increased.

而且随着硬盘道密度的不断提高，对伺服信息刻写的精度要求进一步提高，增加了伺服信息刻写的困难程度。

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