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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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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