FYI:
I was trying to backup some DVDs but I found my DVD drive's (NEC ND-2510A) read speed to be extraordinarily slow. After some research, I discovered many DVD drives come with what's called a riplock which limits the speed at which DVD videos can be read and copied. This was something that was implemented to curtail piracy. So although your drive is rated to be 8x or 16x read speed, the riplock limits the maximum read speed to 2x. To remove this limitation, you can search for hacked firmware online that removes the riplock.