It can only burn at 1x-2x that used with RecordNow and at 2x-4x with Nero6. And I have also found 6 bad disks so far after 12 attemps in which 4 of those I can physically see the scratches and purple spots hidden behind the surface. the reasons i gave it 2 stars because of its price and spindle box instead of in cup cake oem version like other online sellers. Honestly, I've been sucessfully burned with 4x with very low % disk failure with Ritek before where I got them as an oem cupcake version. And don't get me wrong 'cause I could be an unlucky one with this spindle...