Urgent: Copy hda to hdb with dd?

I have a master IDE drive all setup how I want. I want to copy the image of this drive, hda, to the slave drive, hdb. In the end, I want both drives to be exactly the same, boot record and all.

If I boot from the CD drive with LNX-BBC (Linux bootable business card) can I just issue the command

dd if=/dev/hda of=/dev/hdb

and accomplish this?

Is there some other command that does this correctly or better?

Alan