I just purchased a brand new container of Memorex 4.7GB DVD+r's and when I put them into my Lite-On 1633S DVD (it has the latest firmware) burner it states the DVD contains only 702MB of space. What would cause the DVD not to have 4.7GB of space? Is there anything I could do to these DVD's to create 4.7GB of space? Format them? Thanks for looking.