[root@xen ~]#
[root@xen ~]# dd if=/dev/sda of=/dev/sdb bs=512 count=1
1+0 records in
1+0 records out
512 bytes (512 B) copied, 1.8158e-05 seconds, 28.2 MB/s
[root@xen ~]# echo -e "\nt\n1\nfd\nt\n3\nfd\nw\nx" | fdisk /dev/sdb
last_lba(): I don't know how to handle files with mode 81a4
last_lba(): I don't know how to handle files with mode 81a4
last_lba(): I don't know how to handle files with mode 81a4

Unable to read /dev/sdb
-bash: echo: write error: Broken pipe
[root@xen ~]#