Hi following information about the usage of single or double layer DVDs:
The manufacturer of the DVDs must be known in the burner, therefore you need a firmware update, so that the DVD will be recognzied by the burner and the depending burning software.
Nero Burning ROM solved the problem to recognize single and double layer DVDs. If you start NERO without a DVD to be written you get the choice box fot the output type (DVD 5 or DVD9).
When you enter a DVD (e.g. a known single layer DVD), Nero recognizes the DVD and the choice box will not be offered. The ourput format/media type will automatically be set by Nero.
=> So upgrade to Nero Burning ROM 126.96.36.199 and the problem is solved for media types (DVDs) that are konwn by the burn-hardware device.