Power calibration error is often caused by the burner being unable to gauge the laser power required to burn the disk - it's more often a media problem than a burner problem. Save the output from Nero to the HDD. Burn the files using ImgBurn. Use only Verbatim brand DVD+R DL Check the link for the correct burning method. http://forum.imgburn.com/index.php?showtopic=4643
Thank you so much for responding so quickly. I shall try your way this evening when I get home. Again thank you Jenny