Explain the difference between DVD-R and DVD+R
Here is what help desk has in their templates but it should be improved:
Concernig Tails, using a DVD-R or DVD+R is almost the same. Using a DVD+R would allow someone to burn more data is there's some free space, but that's all. Using such DVD doesn't allow someone to modify your Tails. But you'll have to burn a new Tails DVD for every release, which is every 6 weeks. Using a DVD-RW or DVD+RW allow to use only one DVD, and re-burn Tails on it every time a release is out.
It should be added to /install/dvd.