MAC之U盘（制作U盘启动必须是在mac系统中）

参考：https://blog.youkuaiyun.com/sunxiaoju/article/details/80783269

https://blog.youkuaiyun.com/ZhangKui0418/article/details/73650819

https://support.apple.com/zh-cn/HT204904

http://www.pc6.com/infoview/Article_57927.html

https://bbs.feng.com/read-htm-tid-10510823-page-1.html

u盘制作，mac os系统安装：https://blog.youkuaiyun.com/nesxiaogu/article/details/82847840