ubuntu@ubuntu:~$ sudo dd if=/dev/sda of=sda bs=512 count=1 && sudo dd if=/dev/sdc of=sdc bs=512 count=1
1+0 records in
1+0 records out
512 bytes (512 B) copied, 0.000603482 s, 848 kB/s
dd: opening ‘/dev/sdc’: No such file or directory