实际上，缓冲可能发生在其它不同的级别，例如硬盘本身、控制器或内核磁盘驱动设备驱动程序，所以我们的工作可能对性能影响不大。
In practice, buffering may occur at various other levels, such as on the hard disk itself, the controller, or the kernel disk drive device driver, so ours may not make much of a difference.
如果测试是在活动的系统上进行的，应该计划相应的时间以修复测试可能导致的任何破坏，例如路由器或硬盘故障。
If this is a live system, plan time to repair any damage a test may cause, such as a failed router or hard disk.
但有得必有失，例如闪存和硬盘存储数据的方式完全不同，所以运行一些视频处理软件等大程序时就需要一个软件工作区。
But there are tradeoffs too. For instance, flash handles data differently than a hard drives does, so software workarounds are needed for heavy-duty tasks like video editing.
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