Questions around a 4 GB image and dd/script

Hello list-people, I received a 4 GB image, which I used to copy using dd if=/dev/hda of=/dev/hdb And if I need another copy I run like dd if=/dev/hda of=/dev/hdc for instance But now my question is for the script/bash experts: Is there any trick to copy this "hda-image" to BOTH hdb and hdc AT THE SAME TIME or at least with one run? Hope you understand me. Many thanks ahead. TP