Slow reading problem on Samsung R520 Notebook with Liteon DS8A3S

Hi

My problem is slow reading speed of this Liteon DS8A3S.I just bought the notebook yesterday.Nero infotool tell me that it reads at 4x(must be 8x as I read on the specs) but as I see transfer rate is only 1mb/s to 2mb/s.

Because it’s a really new product (made in april) liteon doesn’t have any updates yet.I looked at dma modes on laptop but none can be seen I guess it’s a bad thing of this notebook.

Does anyone know how can I fix it?

Thanks for your time.