Thank you for your replies.
It is shown in windows hardware tab :
I can't see the POST screen as it is too fast .
Also Nero Info Tool just says : DMA ON
I always knew that there are only : UDMA 2 , UDMA 4 and UDMA 5 and Maxtor HDD Shows as UDMA 6 , where did this UDMA 3 come from ? :a