very big problem-i deleted partition!..

today i made i big mistake:i deleted a 650mb-partition in fdisk(no formatting) on my first 4gb-hdd when i was trying to copy a second harddrive to a third. pls do not ask why, its too complicated.
i only need to know if data can be recovered. fortunately i have backed up almost all, but not every data.
i think encase is not the right tool. i will now take away hdd 2 and 3(both fat16-win311).