UUID

1)
$ ls /dev/disk/by-uuid/ -alh
total 0
drwxr-xr-x 2 root root 100 2011-05-05 10:15 .
drwxr-xr-x 5 root root 100 2011-05-05 10:15 ..
lrwxrwxrwx 1 root root 10 2011-05-05 10:15 185de63a-3239-494d-993d-25cac74231dd -> ../../sda2
lrwxrwxrwx 1 root root 10 2011-05-05 10:15 1ca70448-5191-43de-b9e0-3ce9dfa14703 -> ../../sda3
lrwxrwxrwx 1 root root 10 2011-05-05 10:15 4c63ea13-039b-4346-b726-0a0cf59ab86e -> ../../sdb1


2)
$sudo blkid
/dev/sda1: TYPE="swap"
/dev/sda2: UUID="185de63a-3239-494d-993d-25cac74231dd" SEC_TYPE="ext2" TYPE="ext3"
/dev/sda3: UUID="1ca70448-5191-43de-b9e0-3ce9dfa14703" SEC_TYPE="ext2" TYPE="ext3"
/dev/sdb1: UUID="4c63ea13-039b-4346-b726-0a0cf59ab86e" TYPE="ext3"


ref: http://ubuntuforums.org/showthread.php?t=1026957