Data transfer times are typically fractions of a millisecond, so rotational latency and seek time are the primary sources of disk latency on a physical HDD.

数据传输时间一般几毫秒，所以旋转延迟时间和寻道时间是一个物理hdd的主要磁盘延迟时间来源。

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If you have several disks, splitting load onto separate spindles is an effective way of making reads and writes faster because the largest component of disk latency is the seek time.

如果有多个磁盘，那么把负载分配到不同的磁盘上是加快读写速度的有效方法，因为磁盘延迟的最大组成部分是寻道时间。

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Memory and CPU based access can provide much lower latency and greater throughput than disk and network based access.

相比基于磁盘和网络的访问，基于内存和CPU的访问能提供更低的延迟和更高的吞吐量。

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Although magnetic tape sitting in slots in a tape library uses very little energy data latency is high, spinning magnetic disk drives have lower latency but they can use up a fair amount of energy.

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