The technological part of my brain is very, very tiny. By good luck, I happen to have a DVD-writer in my new Dell. It appears to be a Philips "DVD+-RW" 8631. I want to start using it, but I feel a bit feeble when it comes to picking out appropriate blank discs. I understand that + discs will work on +writers and - on negative, but is it really true that this writer can handle both kinds? Are there any limitations that you know off the top of your head? I've googled for some "compatibility charts" but I can't seem to find this model in the charts. Thanks for reading!