I have been trying to get an ISO modded and installed to my HDD. When I get to 47% everytime it say I have a dirty disc. I use Memorex but, I heard that the Verbatim brand was better for ISO mooding. I have tried the speeds of 1x, 2x, and 2.4x in ImgBurn using a Memorex disc and I always get the same error. Can someone help?