pv -tpreb /dev/sda | dd of=/dev/sdb bs=64M
The syntax is
pv filename pv filename > /path/to/output pv options filename | command1 pv options filename | command1 > output.file pv filename | command1 command1 | pv | command2 pv -options input.file | command1 | pv -options > output.file
