Don't worry about it. The information in this thread will be useful for future readers who have the same problem. That the issue was misinterpreted here means that it has been clarified for all future readers to see.
Oh btw, if drag and drop was your preferred way of using a DVD writer, you might want to consider getting a DVD writer with DVD-RAM support for your next one. DVD-RAM discs were made to be used in exactly that way.