root@debian:/home/tiger# dd if=/dev/sda of=/dev/sdb
bs=10240k
11447+1 records in
11447+1 records out
120034123776 bytes (120 GB) copied, 4729.59 s, 25.4 MB/s
root@debian:/home/tiger# blkid
/dev/sda1: UUID="54AF-15B1" TYPE="vfat"
/dev/sda2: UUID="28D02E2FD02E03A2" TYPE="ntfs"
/dev/sda5: UUID="a3464de4-5676-4ae3-b37a-a1f40708d5ec" TYPE="swap"
/dev/sda6: UUID="8b29114c-4f89-4c96-b0c0-579ce58c7345" TYPE="ext3"
/dev/sdb1: UUID="54AF-15B1" TYPE="vfat"
/dev/sdb2: UUID="28D02E2FD02E03A2" TYPE="ntfs"
/dev/sdb5: UUID="a3464de4-5676-4ae3-b37a-a1f40708d5ec" TYPE="swap"
/dev/sdb6: UUID="d38e60d8-6bfe-49f9-a381-d89b3b9bbb7f" SEC_TYPE="ext2" TYPE="ext3"
why /dev/sda6 uuid don't equal /dev/sdb6 uuid?