I've been given around 70 blank DVD-R's from a friend who's moving away and is selling all his computer stuff- he used to sell knock off dvd's and these are the disks he never got round to using. There are some Verbatim but there are loads of Tuff Disk, RiDisk, Traxdata, Gigatain, Titanium, Datawrite, Rivision, Bulkpaq and Intenso disks. Which of these if any would be suitable for making backup disks. I know I could just try them out, but it's the time it takes to burn the disk only to find out they are no good, plus I could sell them as a lot on Ebay and use the funds from that to buy 100 Verbatims. Many Thanks in advance.