are you sure its flashed to 1.51?
btw, burning at 8 is bad for hitachis, 4 is fine, memorex dont support 2.4 so their going to come on messed up if you do 2.4
. I have a hit and liteon, a game that works and read fine on the liteon will take about 5 opening and closing of the tray so the hitachi could read it. So keep trying the same disk, btw use a len cleaner, cause it helped alot