格式化你的电脑：最简单的方法就是用一个次要的硬盘或者usb闪存驱动器。
Reformat Your Computer: The easiest way to do this is with a secondary hard drive or USB flash drive.
格式化或重新格式化硬盘驱动器通常非常耗时。
Formatting or reformatting hard drives is often time-consuming.
无论你是升级或格式化驱动器以安装覆盖，你都一直备份你先前的安装。
Always backup your previous installation, whether you're upgrading or wiping your drive and starting over.
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