# /dev/sdc is USB memory > sudo grub device (hd0) /dev/sdc root (hd0,0) setup (hd0) quit
http://www.ctrlz.jp/lb/grub.html
http://d.hatena.ne.jp/kamopapa/20071118
http://blog.jojo.jp/?eid=1151175
http://watermans-linuxtips.blogspot.com/2009/02/grub.html