the mods will probably get after you for starting thread after thread about the same thing...
i would suggest making this as simple as possible. move some stuff off of the main HD to the 120 gig so you have room. then burn off the laptop HD directly with the hd unplugged from the system.
if that does not work i would try the drive with another system.
my suspicision is that your config is not fast enough to run @8x might want to try 1 or 2x