I'm surprised nobody's mentioned that when you burn a disc you should look closely at the burn dialog box, possibly the "Advanced" tab, where you will find a "Leave this disc appendable" option that will either be selectable or greyed-out, indicating whether or not adding to your disc is possible.
The new Great Equalizer is the SEND button.
In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire
