Samsung M40+ and Teac DV-W28E

Hi,
I have a speed problem with my Teac DV-W28E on my Samsung M40+.
The recorder is sold to write at 8x on DVD-R and I cannot manage to have it write more than 2x. I have tried serveral software and disc… :sad:
I also have a speed problem when I try to rip a Audio Cd…
Anyone has an idea ?
Thanks in advance.

have you enabled your DMA?