After installing this DVD-R and I've expend two days revising almost everythink: DMA's, IDE's configuration, master/slave combinations...etc..
But after installing the last VIA Hyperion 4in1 v4.46 drivers for the chipset all the problems have disappeared at once.
I was able to burn all expect DVD-R's and now is all working fine.
My gear is Asus A7V33 with Raid, XP2100+; W2KSP3, Pioneer DVD-500M, Liteon LTR 52246S and now Sony DVD DW-U10A.
Just in case you're on similar troubles.... my two cents.