I just purchased an iHAS422-08, mounted in a Vantec NST-530SU external case. According to the review on this very forum, the iHAS422-08 has no riplock. In the review, average speeds of 12x were possible on dual-layer DVDs, yet I can't rip commercial DVDs at more than 4x speed with mine. This is on a Mac, but as far as I know Macs have no anti-ripping features. I am not doing any on-the-fly reencoding of the video. What might be the problem?