having a nero problem i just can't figure out. every time i start to write the dvd, it ejects my disk and tells me to insert an empty medium into the drive. it's not a problem with reading my drive, i'm able to burn cd's there just fine. could it be the dvd's i'm using? they're maxell dvd-r's. is there some format function i'm missing? lost on this one. thanks in advance, rob.