参考：
http://www.linuxidc.com/linux/2014-10/108430p2.htm
http://www.jb51.net/os/windows/298507.html
http://zm8.sm-img5.com/?src=http%3A%2F%2Fblog.csdn.net%2Fzhk0377%2Farticle%2Fdetails%2F7837851&uid=a310ba16a139d790a85ec540166ebed6&hid=679929798813d54419eed1b13932bef6&pos=2&cid=9&time=1440614711274&from=click&restype=1&pagetype=0040004002000408&bu=structure_web_info&query=win7ubuntu双系统引导&uc_param_str=dnntnwvepffrgibijbprsvpi
http://zm8.sm-img5.com/?src=http%3A%2F%2Fblog.csdn.net%2Farcsinsin%2Farticle%2Fdetails%2F17143163&uid=a310ba16a139d790a85ec540166ebed6&hid=6d3247ff08abe155e20e2ea409eb68d3&pos=2&cid=9&time=1440612499092&from=click&restype=1&pagetype=0040004002000408&bu=structure_web_info&query=ubuntn+分区&uc_param_str=dnntnwvepffrgibijbprsvpi
