Certain DVD's that I have made, not all, cannot be read by my drive. (Optairc AD-7170A) In my computer, they will play in the program "Power DVD" only. They will show as "1 drive on" in AnyDVD, but if I try the "Rip video DVD to Harddisc" function in AnyDVD, the error comes on and says the drive is not ready. No other program recognizes the DVD in this drive. Under "my computer" the DVD is not recognized. I can put the DVD in my standalone DVD player and it plays fine. This happens with different media brands so it's not that. I have created a DVD I cannot make a copy of. I welcome any ideas or suggestions on this as I am baffled and can't figure it out.