现在，大多数常用的企业硬盘驱动器(HDD)都受到磁头移动速度、盘片旋转速度和查找延时的限制。

Now, the most commonly used enterprise hard disk drives (HDDs) are limited by the rate of head movement, the speed of the spinning platter, and seek latency.

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实际的磁臂必须找到正确的柱面，控制部分需要访问正确的块，并且磁头必须等到这些块旋转到磁头下面。

The actual disk arms must find the correct cylinder, the control needs to access the correct blocks, and the disk heads have to wait while the blocks rotate to them.

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这是磁头下的磁盘旋转到能读取所需要数据的正确位置所需要的时间。

This is the time it takes to correctly position the platter underneath the head so that the desired data can be accessed.

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