VB6 & Erase and Burn a DVD +-RW

Hi All,
I am new to this list and I wanted to write a small VB program for my computer so that I can backup certain folders on my harddisk to a Rewritable DVD, but first of all I want to check if the DVD is empty if not then erase it and continue with burning.

If anyone can point me in the right direction or give me an example it would be great.

Thanks in advance