I have been using my DVD burner to create data disks for some while, without problems. I HAVE NOT CHANGED any settings, or the box of disks, but if I now burn a disk the files on there cannot be read by any other computer. They all say the disk is blank. I have tried a few disks and if you turn it upsidedown then you can see it has done something. Put it in the original recorder and I can see everything. Is it something to do with finalising the disk ?