Hi, I buy this dvd-recorder this friday... I have a problem! If I use HDD-DVD high speed copy with Verbatim DVD-R 8x the disc is unreadable... (I make 4 test) All ok with sony and nashua dvd-r 8x Is this normal ? Or I have to take back the dvd-recorder for another one? I have some problem also with tdk dvd-r 8x, all ok with dvd-r 4x (many brand) Question: can I limit the write speed to 4x ? Exists a firmware that do this? or a hidden menu?