google随便一搜就有了 http://digiex.net/guides-reviews/console-guides/xbox-360-guides
不想麻烦就去买个现成做好的，你先check一下自己的主板是否支持，中间有这么一步
before you carry on it might be an idea to enter you bios configuration and
ensure the SATA operation mode is set to ATA or disable AHCI depending on
the options you have. On some motherboards this can also be called legacy or
enhanced, if you are presented with this you want to set it to legacy. This
will vary depending on your motherboard / bios.
然后我的电脑主板没这个选项，是用朋友电脑做的
