James58899 says to YSITD https://wiki.archlinux.org/index.php/Installation_guide_(%E6%AD%A3%E9%AB%94%E4%B8%AD%E6%96%87)#Mount_the_partitions_.28.E6.8E.9B.E8.BC.89.E7.A3.81.E7.A2.9F.29