Help with DVR-108

Hi all, i have the latest 1.20 firmware and everythings been fine untill 2 days ago i burned a cd-rw at its max 4x, and now all my dvd-rs and cd-rs dont burn past 4x and i checked with nero system info and it says my read speed is 8x and burn is 4x. im not sure how to fix it :confused:

Uninstall the IDE channels in Devicemanager, then restart.
Then check for DMA mode.

How do i check for DMA mode? or what do i check it for?