Hi
If you download Nero InfoTool from ahead.de, it will have ticks against the media you can read / burn to.
If your drive can handle both, then it's up to you which you want to use, as there's nothing different about either of them.
R means you can write once, read many, RW means you can write many times and read many times, like a floppy disk but a lot bigger.
The only thing you need to be aware of is if your drive can only handle single layer disks then avoid dual layer disks as they are expensive and not always compatible
