Hi, I am trying to burn discs on a new Mac I bought recently that has Toast 9 Titanium. They are professional wedding photos (800 of them) that Toast 9 Titanium says is a total of 5.98 GB, I am trying to burn them onto a Memorex DVD-R that is 4.7 GB and it does says it has all 4.7 GB free. Why is it saying it needs to span 9 discs??? Is there some settings or something I need to change? Thanks! Attached is a screen shot that shows this.