cdimage 배포본으로부터 4096MB 크기의 이미지파일생성.

# dd if=/dev/zero of=ubuntu.img bs=1MB count=0 seek=4096
# mke2fs -F ubuntu.img
# mkdir rootfs
# mount -o loop ubuntu.img rootfs
# tar -C rootfs -zxf rootfs_cdimage.tgz
# umount rootfs