Translations:Install Gentoo on a bootable USB stick/46/de
From Gentoo Wiki
(chroot) #
dd bs=440 count=1 conv=notrunc if=/usr/share/syslinux/mbr.bin of=/dev/sdb
(chroot) #
dd bs=440 count=1 conv=notrunc if=/usr/share/syslinux/mbr.bin of=/dev/sdb