That's not a problem. Please follow the next steps to get your DVD Writer Detail Information. Then it will be clear.
Steps to get DVD Writer Device and Disc detail information:
1. Click 
Button on main dialog "Add Media" tab page:
And then you will get burner dialog as the following picture shows:
2. Click 
Button to DVD Writer Device and Disc detail information as the following picture:
The above picture shows you DVD Writer can burn DVD-R Disc, DVD-RW Disc, DVD-R dural layer Disc, DVD+R Disc, DVD+RW Disc, DVD+R dural layer Disc.
comments:DVD dural layer Disc is D9 DVD Disc which is 8.5G Disc.