When I insert the blank disc into the virtual CD drive.
Tabs and Tools > Create a blank virtual medium
Virtual CD Blank Media Wizard
Define the type, size and properties of the blank to be created:
Create a Medium
Inserting the new blank medium after it has been created:
Insert in J:
Close Blank Media Wizard , clicking Create
Where J is the drive letter of the Virtual Burner.
So I am sure I have inserted the blank virtual medium
to the virtual burner.