root@debian:/home/tiger# dd  if=/dev/sda  of=/dev/sdb  bs=10240k11447+1 records in11447+1 records out120034123776 bytes (120 GB) copied, 4729.59 s, 25.4 MB/sroot@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 doesn't /dev/sda6's uuid equal  /dev/sdb6's?Edit, answering questions from comments:sda and sdb are same size diskThe output of blkid -p is:root@debian:/home/tiger# blkid -p /dev/sda6  /dev/sda6: UUID=8b29114c-4f89-4c96-b0c0-579ce58c7345 VERSION=1.0 TYPE=ext3 USAGE=filesystem   
Why did dd create a different uuid?
debian;dd;uuid