root@grml ~ # /sbin/blkid -s TYPE -o value /dev/sda1
2 root@grml ~ # echo $?
2

4 root@grml ~ # /sbin/blkid -v
blkid from util-linux-ng 2.16.2 (libblkid 2.16.0, 10-Feb-2009)

root@grml ~ # /sbin/blkid
/dev/sda4: UUID="F6CC0F08CC0EC33B" TYPE="ntfs" 
/dev/sda6: UUID="F6CC0F08CC0EC33B" TYPE="ntfs" 
/dev/loop0: TYPE="squashfs" 
/dev/sda10: LABEL="" UUID="EA7A-DEFF" TYPE="vfat" 


That confirms my suspition -- I thought the reason is because that I just prepare
the partition with cfdisk -- the partition is not formatted.