I'm using Nero 6 with Sony DRX500ULX. Start from 2 days before, I cannot copy any DVD to DVD-R. But I can do it on DVD-RW. I've got the error message Power Calibration Error. I have check the disc in other computer and it works. I don't think it's the disc problem and the drive is working probably with other computer. Do any one know what's the problem?