Thanks for your reply.
I'm not completely sure what you mean by having USB drive along the line. But the CDVD drive is directly connected to motherboard with Serial ATA so bandwith is not a problem.
I can rip music normally etc. so reading speed is good with other software.
It seems that only problems accure when creating images.
I add image of Window's device controll. How can I know is DMA enabled or not?