DVD discs



I have previously burnt movies to dvd-r discs and have been able to copy & burn additional copies from that burnt disc. I recently purchased dvd-r data discs and find that I can burn to these discs but are not recognized when I try to copy & burn additional copies. Roxio, IMG & Pinnacle will not recognize them. Is there a difference between DVD-R discs & DVD-R Data discs & if so how can I copy the data discs to obtain additional copies.


Not sure of this myself but there is a Blank Media Forum here on CD Freaks where you might find help on this subject


What is the brand and rated speed of both the old and new discs, and what DVD burner do you use?