In the Burn tab of New Compilation or Write CD window, check "Use
Ideally you want the drives with the same model and firmware version,
but all Nero requires is there should be common write speed.
Please turn the volume down on the venom. Mike's answer seemed perfectly helpful
to me. Most people for home use aren't going to need to burn 2 copies of the
same disc at once, so Mike & I both assumed Paul wanted to run 2 *different*
burns at once.