Copy CD using single drive - Nero does not ask for empty CD!

I am unable to copy a CD using Nero 5.5.9.13 with a single (combo) drive. Nero should save an image to my HDD and ask me to replace the source disk with an empty disk. Instead, Nero tries writing to the source disk, resulting in an error.

Does anyone have any idea how to solve this? Please help! Thnx.