This tool tells you how many reads and writes are happening at a particular point in time and how saturated your disk controllers are.
这个工具可以指出在特定时间点发生了多少读写操作，以及磁盘控制器的饱和程度有多大。
You can safely explore at this point because your choices will not be written to disk until you confirm your intentions in the last installation dialog.
此时您可以安全地试探，因为您所做的选择要到最后一个安装对话框中确定后才被写到磁盘。
At this point, back up any information on your hard disk that you do not have a current copy of.
从这点考虑，就需要对目前没有副本的硬盘信息进行备份。
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