I've been using my Sony DW22A DL burner (external) at school on a new (purchased last month) HP to back-up various materials, movies, etc. using decrypter and shrink with no problems...not one coaster using Verbatim media. I took the burner home and hooked it up tp my HP Pavillion zv5000 (purchased this fall) and have gotten nothing BUT coasters with the Verbatim media. When I am burning at homethe buffer (both system and device) jump around a lot. In decrypter I keep getting the error saying "Unable to write to address. Address Invalid." Sometimes it gets halfway through the burn and comes up with this. Sometimes it happens at 50%. There seems to be no problem ripping, just writing. My Primary IDE is DMA Ultra DMA 5 My secondary is DMA Word Mode DMA 2 USB device says that the device is working properly. I am at a loss...any ideas? Anyone? I posted in the Newbie section lastweek with no help at all. I was hoping someone here could shed some light.