通过将暂挂的写操作放到高速缓存中，硬盘固件就可以重新为它们排序，并为它们分组，以便用尽可能最快的方式将它们写到磁盘中。
By putting pending writes into a cache, the hard drive firmware can then reorder and group them so that they're written to disk in the fastest possible way.
您可能不知道，但大多数新式硬盘有一个称为“写高速缓存”的东西，硬盘使用它来收集暂时被挂起的写操作。
You may not know this, but most modern hard drives have something called a "write cache", used by the hard drive to collect pending write operations.
一些新式膝上电脑的硬盘有一个更令人讨厌的习惯：每当重新引导或暂挂系统，就丢弃它们的写高速缓存。
Some modern laptop hard drives have an even nastier habit of throwing away their write cache whenever the system is rebooted or suspended.
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