I copied and burned this with Power2Go Express. I don't keep my movies, I just burn new ones onto a number of BD-RE disks that I have on hand. In attempting to erase the 50 G bd-re, I discovered that it has been made read only. I can't erase any individual files either. None of my erase tools work & with windows xp , I can't change the disk's attributes. Any help is appreciated.